I have Vic MUNKEH , but took them off to change to WA "Euro" plates. Worst thing: only had them on for 2 months before I moved to WA, but thought it would be cheaper to swap to WA licensing (VIC = ~$600, WA = ~$450)... after the visit to the pits, turns out it wasn't...
Found that both are slimline (WA Euro and my slimline Vic Customs), and BOTH had to be "massaged" to fit the narrow space in the back, and bent a little to fit the front. Also I lost one of the bolts changing the fronts, trying to put in new bolts, but that just didn't work.
I don't understand why the WA custom plates allow so much variation (and SPACES!), when all other states seem pretty standard max 6...