As it says in the title,anyone got one 'going spare ' ? ?

Have you thought about making one from aluminium, lighter, cheaper and fits better. Downside is you have to paint it (unless you want the aluminium look) and spend a day making it, but worth it in my opinion.

I have an aluminium one off a Caterham,which is a few inches too wide,I even considered cutting a strip out and getting it welded back together !

A couple of hours work to make an ally one , no special tools just a pair of good tin snips , a rubber mallet a bit of plastic drain pipe ,a bench or workmates and a couple of bits of wood or mdf