Thanks for all the help. the diff in the coupe was a h150 (Bolts holding dif centre) & mine was a 145 ( stud & nut). Couldn't be bothered chasiing the 2mm spacer etc. so I swapped the lot. Only problenm was the shocky mountings were different so I had to fabricate a bracket & weld it on to the coupe banjo spring mount. All good now.
Thanks again for the invaluable help.
Cheers Bob