I had a reason to take the seat bulkhead out today and thought I had better check the fuel tank brackets. No big surprise that one of them is cracked. It looks like I will be doing your repair scheme Bunny, thanks for doing all the development work. I think that although only the RH side is cracked I will do the plate on both tanks, the PU18 is on order. The strap seems pretty tight on both tanks incidentally.
Glad you found it...
A Morgan Identified Fastidious Owner... 2011 4/4 Bespoke, 1981 Delorean, Auburn Boat Tail