I think they are pretty much the same, if you can take measurements from yours in a few places and match them up to the one you have found. also check wiring for numberplate light, chances are the connector will be the same but if its not it could be different for a reason! I would however recommend trying to get the same car though if your in doubt, try searching ebay for breaking rover 400. there's quite a few on there and a choice of colours.

http://shop.ebay.co.uk/?_from=R40&_trksid=m570&_nkw=breaking+rover+400

 

Thanks for the info, you have pretty much confirmed what someone told me verbally.