ACDelco Washer - 11603381 Part #: 11603381 Line: ACD ACDelco Washer Limited Lifetime Warranty Color: Gray Material: Metal Inside Diameter (in): 1.004 Inch Inside Diameter (mm): 26.5mm Outside Diameter (in): 1.630 Inch Outside Diameter (mm): 41.5mm Thickness (mm): 4.5mm Thickness (in): 0.180 Inch Show More Show Less