This is a set of new GM NOS old stock rear drum brake backing plate adjustment hole rubber plugs. GM # 5464803 . They are commonly missing and now you can use the correct rubber plugs. If you are doing a concourse restoration of a GM muscle car like 1964-72 Chevelle, LS6, LS5, L78, Camaro, Yenko, Copo, Cutlass, 442, W-30, GTO, Lemans, Judge, Skylark, GS, GSX, Nova, Monte Carlo these are a must.