I heard it was 7.5 minimum or was it 8.5? i forget.
When I say lip, I mean the hub lip to mimic the continuation of the hub. Normally, 5mm spacers don't have a hub lip. The stock wheel mating surface is carved out 2.5mm for the 70.5 mm lip before it goes to 64.1mm.
The 8mm spacers were 20bux...