Rear Cab Support

[andyh1956]

I brought home a freebee last week & tonight after supper went down to remove the cab. I was given an '84 short K10 cab, frame & L & R fuel tanks.
All the cab mount bolts spun so I had to cut them. On the front I think I can cut some round holes in the floor & access the nuts in there & make that repair. But the real problem is gonna be the rear cab support under the rear of the cab. It's not rusted but busted, broken & some pieces missing! On top of that Bubba at one time crammed a piece of flat bar up into the right side mount area (After he cut a slot for it in the support) & tried to weld it from the bottom! Holy Dirt Dauber Bateman! What a mess!
Anyway this support is quite a substantial piece of metal welded to the bottom of the cab! Also the floor behind the seat has buckled & the bottom of the rear cab where it meets this part has buckled also.
The only rust I have found is in the lower windshield corners & this is fixable. I hate to waste this cab but can't find this support reproduced for the square body truck, only the earlier ones.
I have another '84 up the hill, it got wrecked when a mini van drove up into the cab with me, but I think the rear of the cab is good.
Have any Yall ever had to deal with the rear support on these trucks?
If you have I sure could use some guidance (And Encouragement!)