Hi Trev,
Here is a pic of an RGS with the longer chainguard end on the inner primary case
The part number is 42-7503,
I think there is a similar looking one on Gold Stars with no bolt hole either, obviously different at the crankcase end!
Anyway I hope I havn't spent my money foolishly
I am by no means an expert on the foibies of RGS's
I'm just trying to get the correct bits for the bike build,
Its had a tough life in the hands of previous owners and there are a host of non RGS bits fitted, that said All the vitals are there!!
Cheers
JohnO R