Hi
I thought I would put up my findings from looking into fitting a short nose R200 LSD into a long nose diff, After looking on the net I didn't find all the info I was after
The centre will fit etc, the problem is one of the R30 axels are to short to engage the LSD on one side, to use the short nose axel flange setup you will compromise the oil seal as they are a different diameter by a few millimetres.
My conclusion was to make it work I would need to spend some time on the lathe modifying the shaft etc and cost as much as a aftermarket centre. I decided to go with a Quaife centre and cost the same amount with no stress.
Enjoy
Steve