what size are the centre caps on the spider 17" alloys? as i have none on mine 

thanks in advance

I've got a brand new set of centre caps if you're interested?

They should be 55mm from my last measurement when I ordered badges for them.

They should be 55mm from my last measurement when I ordered badges for them.

 

I also measured a set to order the right size Pasty badge, and they were 55mm across the surface (something like 50mm across the clips on the inside)

Well I want to order some blank caps to then get some gel badges for them. So need to know what size to order. Can't measure mine ATM as car having body work done.