Thanks for a great answer mate.
The reason i ask is that i have a 7.5inch r&d diff, and the standard crossshaft didnt fit, because it was to small.
But on the other side there is a flange, so i probably need to fit a grp a item on this flange.

So then it leaves me with a couple more questions.
will a grp a/wrc xshaft fit in the standard cossi 4x4 sump? (the differential needs some machining to fit..)
if not what is the price on grp a sumps?
and does the grp a driveshafts have the same splined end as the original shafts so it fits standard wheel hubs without any problem?