I haven't really done any substantial welding in quite a few years, so this stuff won't be pretty, but it's better to hone up on my skills underneath the truck, than waiting until I get to the body.
Here is one of the rear mounts, before and after replacing.
Here are some pics of one front mount, with the new piece I made next to the old one and then all welded in
The CCP supplied c-notch mocked up before painting. Had to work on a couple of the holes, so I wanted to do that stuff before painting.