[ERASER5]

I swapped from a GM12 bolt to a D60 so I had a similar problem. The original U-bolts are square to go over the springs with a plate on the bottom. After 40+ years, all that dirt piled up in the 4 pockets on each plate has most likely ruined the U-bolts. Time to upgrade.

I went, and also recommend, round type or normal U-bolts and fitted a flat plate on top of spring pack. I used off the shelf U-bolts from AutoZone and the top plates from a Jeep Cherokee in the JY. Easy peazy. You may have to find factory U-bolts due to the 4 inch tubes. And the top plate from the same donor. I was looking at dead Fords in the JY went I spotted the Cherokee.