Manufacturer Part Number : 238LD57. Application : Geo Prizm Drum Brake Wheel Cylinder. 1990 Geo Prizm Bore: 11/16 In.; Position: Rear Right;. 1991 Geo Prizm Bore: 11/16 In.; Position: Rear Right;. 1992 Geo Prizm Bore: 11/16 In.; Position: Rear Right;.