How bizzarre! I was just down at Supercheap Auto tonite and was asking them if they had any spacers ... got a blank look:
"As far as I know, only the boss and the wheel go together ... nothing else inbetween ..."
Anyway, I shall get my 5mm spacer for my Autotecnica Boss this Saturday. $110 but at least it's a quality product from Racegear Revolution with the right clearance for me.
Unfortunately I will have to ditch my existing Autotecnica wheel and upgrade to a MOMO or something with similar boltings - I'll give it to the Autotecnica boss though as they are compatible with MOMO and the likes.
I spoke briefly with the guys at Racegear Revolution and they apparently told me that ADR regulations only allow the boss to be the same size as the original wheel, which probably explains why we don't get Sprinter boss that are extended ... not here in Australia anyway ...