Update. Bison cover arrived but did not fit correctly, I got in touch with Rob who could not of been more helpful and apologetic, he did say they had had a few complaints lately and thought they had been supplied with a bad batch.
He sent me a complete mirror as a way of apology and I have just fitted it, overall the fit is very good, appearance to me is the same as OE, drive test if I am critical the view is very slightly blurred when travelling at any speed but not bad enough to make ID of fallowing vehicles a problem.
All electrics work but need a frost so I can check that it heats up. So for the price I would say that it is worth every penny (if I had paid
) and the customer service is second to non.