E30 BBS Centre Caps

[bmewha]

Recently got myself a set of the E30 BBS 15" wheels but came without centre caps..

I've been looking around on ebay and there's loads, but i'm unsure what centre caps will fit..

I've found a guy selling a set of 4 in good condition, but they're plastic, so would anyone know if they'd fit at all?

link included!

http://www.ebay.co.uk/itm/120940785689? ... 500wt_1204

any help would be much appreciated!