bugsy
The chance of getting flagged cant be that great just keep some standard rims for inspection time.
I think that the hi-way boys might check tread depth if their being real pains but unless your adapters / spacers have big daggy welds on them and appear a home job I seriously doubt that they will know much better.
Currently on eBay thought you might be keen
The boxes have a genuine look to them
(( VW Wheel Adapters
Here we have a set of 4 VW wheel adaptors. They adapt 1967 and earlier VW 5 lug brake drums to.....General Motors ( Chevrolet, Pontiac, ect) and HQ - WB Holden stud pattern.
They are in brand new condition, never used.
http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&category=72456&item=4548815088&rd=1 ))