Cheers, chaps!
The rims are fairly rare, there was a BNIB set going on Nasioc & LGT, I was making inquiries with the vendor, then this used set came up on IM.
There are, to my knowledge, no pics of these Prova Edition rims fitted to a Subaru anywhere on the internet, nor any info on the Prova.jp website.
So I relied on Marks advice heavily as regards this purchase.
At the same time there was a polished Brembo kit going on Nasioc, Mark found a BL/BP set on IM, we discussed options to suit the theme of the car and ran with those inspirations.
Its a recurring maxim: take an idea and run with it.