Busted rear shock mount

[zac]

I've done some searching of the boards and haven't come up with anything for this yet. While doing the axle swap on my '79 K20, I noticed one of the upper rear shock mounts was just flopping around in the frame hole. It had clearly been swapped out and some point, but never fit right as it is much too small for the hole in the frame. I'm afraid the frame hole has ben hogged out even larger by years of this, and I may have to weld it up, if I can get to it without taking the bed off. I'm not seeing this part in the usual catalogs. If I have to, I will eat my Wheaties and drink 10 cups of coffee and head down to the boneyard with the appropriate tool kit (BFH, 3/4" drive ratchet set, can of PB, torch). But I would rather avoid this. Ideas?