panman,

Here are some pics of the rear shock mounts on my '5? 3800 frame.

http://rides.webshots.com/photo/2649744290098190200EhuoTY

You should be aware that the axle in the pics is not the original axle from the truck, but a replacement I am installing. I have not yet attached the bottom shock mounts on this axle.

You will see the little 'cups' mounted on the brackets where the rubber grommets and upper shock stud mount go through.

If you need some measurements or dimensions, let me know.

Lane

1959 Chevy 1/2-Ton parts for the
1957 GMC 1-Ton