Here is a link to a picture of my right rear cab mount on my '50 Chevy COE, as I found it after removing the cab.
http://s1116.photobucket.com/user/1950Cabover/media/IMG_0333_zpsb06925b7.jpg.html?sort=3&o=21

I don't recall any pads. As Tim commented, the standard bushing sold for the pick up cab shackle fit perfect (obtained from Jim Carter). I just media blasted them, painted, fit the new bushings and re-installed.
Kent


1937 Chevy 1/2 ton
1942 Chevy 1/2 ton
1947 Diamond T Model 509
1951 Chevy 1/2 ton
1950 Chevy COE Model 5700 ~ "Barney" ~ And more pix