I checked with Cadillac, they want over $300 for their spare tire caddy made out of foam board. I think I will just line this area with sound deadener and put my spare tire, which I got a good deal on from private seller, in it without the caddy version. I am due for a new set of tires, anyone know what the quietest ones would be?? Cadillac says Mitchelle but I don’t believe it bc that’s what it all ready has and they aren’t quiet.