Just bought a barely used single Eagle rod off someone on the link forums for $75 shipped!
MAP is able to order me a new single Mahle piston. Just have to make sure I get the correct overbore size before I do it.
The other 3 pistons/rods are removed and they all look to be in good shape as far as I can tell.
I may be able to have this thing back up and running quicker than I thought