is it just the rear cab support? they sell rear and front for 60 to 66. the rear are always weld in and front can be bolt/ weld or slip over and weld. i kinda hate changing cab supports getting it lined up and everything, slowly tacking them in. seems the rear has bolts that go thru rocker to rear cab support. i usually drill holes in the new support and bend metal to get it all sealed up and welded in, a fairly slow prosses for me. the repo rear supports i've used are from lmc, and are not as heavy gauge as the front bolt in ones. always some trimming to do as well, again kind of a pain crawling in and out. hr