Where to buy sti wheel cap that fits my10 gt standard wheel?

[swingn]

Not 100% sure in the Gen 5's, but I know with the Gen 4's the STI centre caps where a different fittment to the standard centre caps... I actually wanted to get the black STI ones for the black Spec B wheels I had at one stage, but it was a no go sadly.

Personally, I think your better off getting you hands on some nice STI centre cap stickers (I know a few members have used them).