Success (of sorts)
for info
distance between the mounting holes is approx 129mm, one hole is slotted
overall height when assembled is 90mm.
here is how i fixed mine . . . . .
I cut the side from a piece of 50mm box section, leaving 3mm each edge, 30mm wide with an 8mm hole in centre. about 6mm corners chopped off and radiused
45mm long 8mm bolt pushed through the steel then with fairy liquid (and some choice language) managed to get it inside the mount and bolted it to the ally plate (mine was just 'dis-bonded' ) I'd cut a slot into end of the bolt so I could tighten it but a longer bolt might have been easier? ie cut excess off afterwards?
once pulled up tight i locked it in place with a half nut I'd used a clinch nut and then felt the half nut gave me belt & braces.
mind you getting the mount out was a PITA. I couldn't get enough leverage to slacken the 15mm AF nut on top of mount so resorted to removing the whole steel bracket with remains of mount.
to do this i dropped rear of subframe down to end of the nuts, biggest issue was that the bolts holding the mount in went in from exhaust side so had to split exhaust joint (which I'd just got gas-tight) to wriggle the bottom bolt out. on re-assembly I put it in from gear-box side. still a fight to get the steel work out/in past the various obstructions. Wish I'd done it when sub-frame was off.
to hold engine up I put a section of 3" box across top of pillars and cargo strap around back edge of inlet manifold to keep the back edge up .
so to sum up, maybe the EASIEST option is to use the likes of a ford mount, (as here
https://www.tickover.co.uk/shop/content ... p1000.html) putting a M10 nut hard against EACH side of the steel plate of the mount then simply bolting it onto the existing pressed ally plate?
I reckon ally plate is 20+mm deep, the engine mounts are about 55-60mm thick so a pair of nuts will bring overall height to the 90mm required.
note that the welding and flange drops down on near side so need a spacer anyway to get clearance.
the hole in mounting bracket is 'generous' nearer 14mm than 12mm