Pic 1 is of a standard X spoke. No question there.

Pic 2 is of an alloy fitted to Pogweasels old 316.
I know it's a Borbet (it says so on the rim). It's a 7x15H2 & it carries the codes KBA41449 & B70525.
Q 1 - Is the centre cap the standard item? Theres something about it that makes me think it's from a different Borbet design.
Q 2 - If it is the wrong one, does anyone know where to get the correct one?
Q 3 - The centre cap is secured with what looks to be like a tamper-proof Torx (see bottom pic - excuse the quality). If it isn't a Torx, does anyone know where I can get the proper key/tool?
Q 4 - Where these wheels a BMW optional fit for the E30 or an aftermarket job?









