Just installed these Body Mounts on my 1985 Chevy K5 Blazer. I ain't going to lie, took me two days to install these due to the 5th position body mount. (Working in 105 degree heat) Just a suggestion, if you ever replace the gas tank on your K5, take the time to replace the body mount next to the tank. Otherwise you're going to hate yourself.I had to remove the rear bumper in order to remove and install the 5th body mount. All the other body mounts were a piece of cake.I had to drill the washer holes a little bigger to make them fit the OEM bolts. It was pretty easy with a step drill bit. I'm still building my Blazer so I don't know how well the body mounts will work while driving, but I'm guessing they be better than OEM rubberThese Body Mounts are slightly smaller than the OEM mounts but they still fit the blazer. The two OEM rear body mounts (4th and 5th position) are square in shape. These are round but smaller and they fit perfectly in the 4th and 5th position.