Dont bother.....you wont need a 50 mm socket if you just take them to Frank Pons then let him revalve them.Then they will be great.(He is in sydney though)
Thanks, Its already been re valved and handles great, just need to do fork seals and have a fiddle with oil levels. I did find this Italian site which have some pretty cool stuff http://2tracing.it/ricambi-gas-gas/sospensioni/
The caps are not tight eg o ring seal seat, so i cut a steel plate accurately resembling a basic (large) two sided cycle spanner...ok, its in my tool box for the next time.i used an angel grinder with the narrow stainless steel cutting disc & then dressed it all nice and smooth...