I have here a Cessna P/N 0453277-15, which consists of a piece of wire and a spring. The wire is 11 1/2" long, with a hook on one end and a loop on the other. It looks like one installs it by slipping the spring onto the wire at the hook end , then passing the wire though the front baffle, then hooking it on the back baffle. The spring would then be in compression between the loop and the outside of the front baffle. Cessna probably wants $500 for it, but the same thing could easily be made at home for less than a dollar.

For those who want to try, the spring is 1 1/4" long by 3/8" diameter. The wire is fairly stiff like piano wire.