i got tramp off the back pylons and pulled out the old plugs. they looked like swiss cheese. the foam had degraded quite a bit. i found one of the kids fun noodles and cut me off a piece. it is made of closed cell foam and was the perfect diameter. fun noodles are long pool floats. for the front pylons i pulled the bolts out and found the same problem with the foam. since i couldnt get apart, i went to the store and bought some expanding foam( the kind in a spraycan). i shot some in there and let it fill the voids in the old foam. i then punched the bolts through the foam.