1971 K5: Bumper Questions

[Jetfire Jr]

First off, thanks sooo much for all the info here! Not sure I'd take on this project without some 'backup'.

I've been working on a 1971 K5, started with mechanical and now I'm working on metal. A few pictures attached.

The PO "custom" welded a truck bumper on, I did not like. I got the truck bumper cut off, but the PO did such a sweet job with his welding... I can't see the original bumper bracket mounts. Can anyone help me with a measurement from the outside edge of the frame horn (I can still see it) to the inside edge of the bumper bracket?

Trying to get the distance right.