Heat and time are the enemies for all rubber parts. Inspect your spare tire well, you may find these plugs missing entirely! Two needed per car. Plug can also be used for the end of the rocker panel plug. #825 will work on any 1955-1957 Chevy model.PLEASE NOTE! This is not an OE replica, but it has been tested and proved to perform the same protection as the original & previous OE products.