I have a pre-facelift SRi Vectra and I need a new front bumper.

Can anyone advise on what other models have the same bumper? Is it just the exact model I have, or does any other model (or even the facelift SRi model) suit as an exact replacement?

Also, can anyone advise on the best place to get a replacement bumper? eBay seems to be the best option I've found, but I'm not sure. I'm in Northern Ireland.