The extended Rose Joints arrived, but there were two problems with them
1 - The thread on the joint was 7/16" UNF and not 1/2" UNF
2 - The length was too long, allowing the lower wishbone to hit the main chassis.
Spoke to GAZ again, and they are going to make some slighty shorter ones at 52mm from plate to Center hole (instead of 60mm), and also make sure the thread is 1/2" UNF.
For reference 12mm piston rods have 7/16" and 14mm piston rods have 1/2" hole.
Returned the 60mm extensions for exchange.
Good customer services at GAZ :)