Anybody replaced lower radiator mounts while the support is in the truck?

[Rob68c10]

I have discovered that besides going with a custom aluminum radiator, I will not find a drop in replacement. If you go to buy a replacement from Autozone, Napa, Rock Auto, etc., they will have the right core size, but all are made to fit the wider 4 core mounts. I was trying to get away with finding a used one, or just a cheap one from the parts store to hold me for a couple years until I tear the truck down. I already have a 4 core radiator so I figured I would see how much of a pain it is to install the 4 row mounts in my truck. It looks like a pain in the rear, as the mounts are right over the frame. Has anybody swapped them while the support was still in the truck?