I found that you have to use the High Pin Conversion or dremel the chassis to get enough clearance for the CR wishbones to pivot freely.

tried it at tallyban didnt like it, the rear end was not as good as std rear end,will try it else were and see what happens.

I have a packet of the XXX-CR wishbones and a packet of XX-4 WE arms and is it right that the CR wishbones are quite a lot shorter in length to the XX-4 WE arms?

how much by if the outer hole of the cr wishbone is in line or there abouts with the inner hole of the xx4 wishbone then yes they are right.

A

The arm isn't really shorter no, running the outer VLA is a similair length to the old arms. As Ash says inner shock hole on old arms is outer on new give or take. The 2nd outer hole (it's centred in the hub) in the new hubs is ablout the same length as the old outer hole, but with 0 washers it is slightly higher than the old outer camber link hole.