They are lovely wheels IMHO - I fitted a set to my 3.0Si Coupe.
But I believe they are no longer available so could be hard to find. If you could live with 19s you could improve the odds by including 230s as they look exactly the same, they're just a bit bigger!
There's a photo of them on IRD's red E89 on here:- https://z4-forum.com/forum/viewtopic.php?f=2&t=27575&start=165
And the 295s on my Coupe on the previous page.