72 c10 front upper shock mount replacement

[mike16]

I have a 72 c10 long bed fleet side with the 307/465.

The front upper shock mounts need replacing.

Auto parts stores recommended the Dorman part number 31001.

It does not work. Its diameter is too small for the existing hole in the frame.

What are others doing to address this issue?

Other part numbers? Vendors? Solutions?

Also because the previous owner ran into the same problem and used the wrong fastener, the mounting hole in the frame is wallered out.

What solution works to fix the oversized hole?

Thanks all.