The use of a sub-assembly service part has improved the replacement of the lower rail assemblies of the engine compartment on Oldsmobile and Buick vehicles. The use of a sub-assembly service part helps simplify the following actions:

The lower rail service part comes as a complete unit. The lower rail service part includes all brackets and reinforcements. You may also purchase the front extensions as separate service parts. The lower rail replacement procedures are available through GM service parts operations (SPO). You must order these procedures separately from SPO.