Proflow Engine Mounts, Steel Engine Conversion Mount Adaptor LS1 LS2 Into For Holden HQ HJ HX HZ, Pair - PFEEHMLS10Part Number: PFEEHMLS10 These LS conversion engine mounts and plates allow you to swap LS engines into various chassis types using 3 bolt engine mounts. The conversion plates are CNC machined from billet aluminium to provide an accurate, sturdy component while the engine mounts themselves are constructed from carbon steel.