sorted. for anyone having the same question; these are 72.1
this is an uncommon fitment and shops will try to sell you the super dear alu ones from Oz themselves.
BUY COMMON 73.1 SPIGOT RINGS and simply sand down the outter edge with a small sheet of sandpaper.
it only needs 1mm taken off both sides so its actually MINIMAL. works a treat and costs 70euro less than the oz ones!
ye're welcome LOL