This bellhousing will accept either top or side mount oil pump mounts, Bert/Brinn idler gears, Quarter Master 110 tooth ring gears, Bert / Brinn standard rotation starters or Quarter Master reverse rotation starter. For the racer, we have used the latest in design software and FEA analysis resulting in the stiffest, lightest and most durable housing on the market today. LIGHTWEIGHT MAGNESIUM CLUTCHLESS REVERSE MOUNT STARTER BELLHOUSINGDesigned to accommodate Top or Side Oil Pump Mounts Compatible with Quarter Master's true reverse rotation starter with 91-tooth flywheel. Eliminating need for idler gear components. Available with Bert/ Brinn style Idler and Flywheel Lightweight pump brackets tie into the bellhousing for unmatched pump support and strength Completely CNC machined to ensure a perfect fit every time.Pit Stop USA offers Quarter Master Magnesium Bellhousing (Only) - Bert, Brinn Uni-Mount 110115 at low everyday prices. Be sure to check out all of our products from Quarter Master including Quarter Master Magnesium Bellhousings and Quarter Master Replacement Parts.