Parts Geek - For 1978 GMC C15 Wheel Cylinder Rear API 28557BQNT OEF3 -- 11.15 x 2 3/4" Brakes. Notes: OEF3 -- 11.15 x 2 3/4" Brakes. 1978 GMC C15. Position: Rear. Ensure Proper FitTo confirm that this part fits your vehicle, enter your vehicle's Year, Make, Model, Trim and Engine in the Compatibility Table.
