I'm ready to mount radiator core support to the front cross member. The assembly manual shows several "shims" above and below the crossmember. The kit I ordered from Jim CArter has only two square rubber pads. My question is do these go on top of or underneath the crossmember. Also what thickness shims and how many? I suppose this effects the fit of the hood and fenders. Any comments from someone who has been there would be appreciated. Thanks