Dorman 555-045 Expansion Plug
Confirm Fitment Before You Buy
Not sure it fits? Message Year/Make/Model/Engine (2WD/4WD if applicable) and we’ll help confirm compatibility.
Why buy from Koskowski Automotive?
• 50+ years (since 1972) • Dorman Authorized Seller • Fast shipping • Easy returns
Regular price
$22.31
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Vehicle Fitment: Use the table below to match your exact configuration. If you don’t see your exact setup, message us before ordering.
Product Description
This engine expansion plug is designed to match the fit and function of the original part on specified vehicles. Made of quality materials, it is engineered for reliable performance.
- Direct replacement - this engine expansion plug matches the fit and function of the factory part on specified years, makes and models
- Ideal solution - this plug is a reliable replacement for an original part that is missing or has failed due to fatigue
- Durable construction - this part is made from quality materials to ensure reliable performance and long service life
- Trustworthy quality - backed by team of product experts in the United States and more than a century of automotive experience
Detailed Applications
| Year | Make | Model | Configuration | Positions | Application Notes |
|---|---|---|---|---|---|
| 1989 | Chevrolet | P20 | L6 292 4.8L | Rear | 1 Required; Steel |
| 1989 | Chevrolet | P30 | L6 292 4.8L | Rear | 1 Required; Steel |
| 1989 | GMC | P2500 | L6 292 4.8L | Rear | 1 Required; Steel |
| 1989 | GMC | P3500 | L6 292 4.8L | Rear | 1 Required; Steel |
| 1988 | Chevrolet | P20 | L6 292 4.8L | Rear | 1 Required; Steel |
| 1988 | Chevrolet | P30 | L6 292 4.8L | Rear | 1 Required; Steel |
| 1988 | Chevrolet | R20 | L6 292 4.8L | Rear | 1 Required; Steel |
| 1988 | Chevrolet | R30 | L6 292 4.8L | Rear | 1 Required; Steel |
| 1988 | Chevrolet | V30 | L6 292 4.8L | Rear | 1 Required; Steel |
| 1988 | GMC | P3500 | L6 292 4.8L | Rear | 1 Required; Steel |
| 1988 | GMC | R2500 | L6 292 4.8L | Rear | 1 Required; Steel |
| 1988 | GMC | R3500 | L6 292 4.8L | Rear | 1 Required; Steel |
| 1988 | GMC | V3500 | L6 292 4.8L | Rear | 1 Required; Steel |
| 1987 | Chevrolet | P20 | L6 292 4.8L | Rear | 1 Required; Steel |
| 1987 | Chevrolet | P30 | L6 292 4.8L | Rear | 1 Required; Steel |
| 1987 | Chevrolet | R20 | L6 292 4.8L | Rear | 1 Required; Steel |
| 1987 | Chevrolet | R30 | L6 292 4.8L | Rear | 1 Required; Steel |
| 1987 | Chevrolet | V20 | L6 292 4.8L | Rear | 1 Required; Steel |
| 1987 | Chevrolet | V30 | L6 292 4.8L | Rear | 1 Required; Steel |
| 1987 | GMC | P2500 | L6 292 4.8L | Rear | 1 Required; Steel |
| 1987 | GMC | P3500 | L6 292 4.8L | Rear | 1 Required; Steel |
| 1987 | GMC | R2500 | L6 292 4.8L | Rear | 1 Required; Steel |
| 1987 | GMC | R3500 | L6 292 4.8L | Rear | 1 Required; Steel |
| 1987 | GMC | V2500 | L6 292 4.8L | Rear | 1 Required; Steel |
| 1987 | GMC | V3500 | L6 292 4.8L | Rear | 1 Required; Steel |
| 1986 | Chevrolet | C10 | V8 350 5.7L | Rear | 1 Required; Steel |
| 1986 | Chevrolet | C10 Suburban | V8 350 5.7L | Rear | 1 Required; Steel |
| 1986 | Chevrolet | C20 | L6 292 4.8L | Rear | 1 Required; Steel |
| 1986 | Chevrolet | C20 | V8 350 5.7L | Rear | 1 Required; Steel |
| 1986 | Chevrolet | C20 Suburban | V8 350 5.7L | Rear | 1 Required; Steel |
| 1986 | Chevrolet | C30 | L6 292 4.8L | Rear | 1 Required; Steel |
| 1986 | Chevrolet | G10 | V8 350 5.7L | Rear | 1 Required; Steel |
| 1986 | Chevrolet | G20 | V8 350 5.7L | Rear | 1 Required; Steel |
| 1986 | Chevrolet | G30 | V8 350 5.7L | Rear | 1 Required; Steel |
| 1986 | Chevrolet | K10 | V8 350 5.7L | Rear | 1 Required; Steel |
| 1986 | Chevrolet | K10 Suburban | V8 350 5.7L | Rear | 1 Required; Steel |
| 1986 | Chevrolet | K20 | L6 292 4.8L | Rear | 1 Required; Steel |
| 1986 | Chevrolet | K20 | V8 350 5.7L | Rear | 1 Required; Steel |
| 1986 | Chevrolet | K20 Suburban | V8 350 5.7L | Rear | 1 Required; Steel |
| 1986 | Chevrolet | K30 | L6 292 4.8L | Rear | 1 Required; Steel |
| 1986 | Chevrolet | K5 Blazer | V8 350 5.7L | Rear | 1 Required; Steel |
| 1986 | Chevrolet | P20 | L6 292 4.8L | Rear | 1 Required; Steel |
| 1986 | Chevrolet | P30 | L6 292 4.8L | Rear | 1 Required; Steel |
| 1986 | GMC | C1500 | V8 350 5.7L | Rear | 1 Required; Steel |
| 1986 | GMC | C1500 Suburban | V8 350 5.7L | Rear | 1 Required; Steel |
| 1986 | GMC | C2500 | L6 292 4.8L | Rear | 1 Required; Steel |
| 1986 | GMC | C2500 | V8 350 5.7L | Rear | 1 Required; Steel |
| 1986 | GMC | C2500 Suburban | V8 350 5.7L | Rear | 1 Required; Steel |
| 1986 | GMC | C3500 | L6 292 4.8L | Rear | 1 Required; Steel |
| 1986 | GMC | G1500 | V8 350 5.7L | Rear | 1 Required; Steel |
Product Specifications
| Describe Type: | Cup Type |
|---|---|
| Material: | Steel |
| Maximum Diameter: | 2.021 in |
| Minimum Diameter: | 2.003 in |
| Package Contents: | Expansion Plug |
| Package Quantity: | 10 |
| Brand: | Dorman - AutoGrade - Boxed |
| Packaging Type: | Box |
OE Numbers
| DIRECT OE CROSS | |
|---|---|
| 3789860 | GENERAL MOTORS |
| 555695 | GENERAL MOTORS |