You are buying a rod and main bearings kit for the following GM Marine engine.

GM Marine 4.3L 262 OHV V6 12V 4.000 Bore

Rod Bearings Part numbers: CB1358P8 or BB623J

Available size: STD, .001, .010/25MM, .020/50MM, .030/75MM and .040/100mm

Main Bearings Part Numbers: MS1454P or BC317J

Available size: STD, .010/25MM, .020/50MM, .030/75MM and .040/100mm

Please email me or put a note after purchase of what size you would like me to ship out.