Four Stage Dry Sump Sprint Car Cam Drive Oil Pump. 1" housings. 1 3/8" housings no extra charge. 2" housing add $50 per stage/section. Fuel pump drive option add $98.88. Please specify in comments field right or left hand mount, small or big block chevy mount, desired housing size for each stage, rotation, and fitting size (-10 for 1" housing size; -12 or -16 AN or 1 3/8" or 2" housing size) or call Mike at R&R Racing Products (815) 465-6741 when ordering.