try tps 02392 653133 - they got me a really small part, that I was sure you could not get the other day for my mk2 golf. This is the Portsmouth branch but they are nationwide.http://www.harwoods.uk.com/trade/view/202
The other people to try are GPC... Do a google for them.. they carry some oem NLA parts...
These guys?http://www.gpcvwaudi.com/Their website has been underconstruction for ages