I looked into this in great detail before deciding to have Tanks mirrors aluminium coated.
I used a company in Reading called Chromed Up:
http://www.chromed-up.co.uk/home.html
They can do many finishes, but if you're after a proper 'S' car look, it should be aluminium covered and with a satin laquer.
For best results, get a new pair of shells and use wet/dry paper to remove all the moulding lines - this way, the finished mirror shell will look like a one piece casting.
Cheers,
Mike
cheers Mike
BTW... are your for sale
Er, might be if the price is right?!
Cheers,
Mike