well, the things you find when playing on the internet.
I was looking for the 8 inch MII 5 lug axles and I think I have found them.

Place called Dutchman Axles.

They list axles for the stock 4 lug, but they offer a custom option for the bolt pattern, so I ordered the 5x4.5.
Should be getting a call later today from them, as you can't pay online.
Not real cheap, but better in my mind than trying to have the old ones welded/redrilled.
https://dutchmanaxles.com/

and here is the link to their chart of part numbers and sizes.
https://dutchmanaxles.com/images/sr-pob/SR-POB-Ford-Car.pdf
SR#182 is the one for the Pinto/MII 8inch rear. Like I said, stock is 4 lug, but you can customize it.
They do also list axles for the 6.75 rears.

I will update this if there turns out to be any issues.

Russ