In reply to RossD:
VW's use a 57.1mm centerbore so are a tad larger than the Mazda but will fit. The Ronals have a huge afftermarket size bore of 70+mm so getting centering rings for them shouldn't be an issue.
I still remember when those Ronal R10's were $99 each regular price and $89 on sale 3 times a year. I just cannot fathom dropping over a grand on a set.
The R10's were sold in two offsets. The only difference was that the low offset version came with a spacer held in by an O-ring.