Engine Mount INSERT: 73-92 F CHEVY v8 (polyurethane)This is the ENERGY SUSPENSION kit for the Clamshell style GM engine mount found right across the range of Chevy V8 GM vehicles from '73 onward.. both cars and trucks. and all the way thru the 3rd gen series of Firebird and Camaro with a Chevy V8. Made of superior HYPER FLEX performance polyurethane, the redesigned GM "Clam Shell" style insert configuration allows you to insert thee performance mounts into your EXISTING metal shells. If you want to