Talk Morgan Forums Morgan Sports Cars Classic Morgans (pre-CX) Rutherford rear shock conversion on 4/4 fourseater

Good news that you've found the cause of the issue. Fingers crossed for a simple solution

I'm no expert on physics/load ratings, but I wonder if you'd get away with just a spacer plate/shim just for the top two bolts rather than a full plate. Be easy to work out the depth from your plywood spacer.

I also wonder how much 'flex' there is at the top of the chassis rail, I wonder if you fitted the bottom two bolts on the plate, and the top seat rail bolts you could pull in the top chassis rail with the top bolts on the plate?