Ok so I did the search and couldn't find an answer, I installed my new C10 mounts on my C20 cab but ran into a problem. When I installed the bolt that goes into the bottom of the cab it is completely bottomed out but the bottom rubber piece never compressed. It will spin slightly by hand. I assume this is not right and am wondering what to do. I know I can put a stack of washers on it but not sure thats the right way to fix the problem. I went to Home Depot for a zinc coated replacement to my O.G. bolt a while back and they had nothing like the bolt for the C20 mounts so I'm not confident that they will have anything similair to the C10 bolt. I tried the C20 bolt but it is too short. The rubber pieces are in good shape and are not mashed down and distorted at all when not installed so I am at a loss. Any help appreciated. Thanks in advance.