Holley's new Low Mount Accessory Drive Brackets and Complete Systems have the components tucked in tighter to the block and mounted lower for a more attractive and compact package. Ideal for LS engine swaps with limited space or where a low, more attractive appearance is desired. The Low LS bracket and complete kits fit the middle spacing (installation kit # 21-4 is REQUIRED with the Long crank pulley). Low LS Accessory Drive Fits Middle and Long accessory spacing only (does not fit Short accessory spacing Corvette/CTS-V/G8). Customers with short spacing can swap out water pump and crank pulley to convert to middle or long spacing. Long Spacing requires Installation kit 21-4. For all LS Engine Swaps-Please refer to your specific body style engine mount kits for additional modification and fitment requirements.