Re: BA XR8 rims on Territory
Tezza rims have a higher load rating than BA or AU Falcon rims. Rims load ratings are expressed in kg as well, so there are no codes to look out for.
Aftermarket wheels with the right load rating probably wouldn't be hard to come by, but the tyres would be a bit of an issue. Also, it'll be a lot easier to get away with non-load rated rims than tyres. I mean, if a wheel's good enough to support XR8's heft, the Tezza should be fine as well. However, there aren't too many 102+ rated 18" tyres.
You'd need 255/50R18 tyres btw.