This is the Integy Purple Aluminum Front/Rear Bulkhead for the HPI Savage 21, 25, and SS trucks.  These are very strong, and the look great.  It won't flex as much as plastic.  This will work on the front or rear of the truck.  If you would like to upgrade both the front and rear bulkheads, purchase a quantity of "2" packages of these.  This is a great addition to any Savage, especially if you want it to be strong or look nice.