It really is a case of what suits you, but if for an A7 Ruby have a look at the mirrors made by Willie McKenzie. They are well made period reproductions and fit over the door hinges, no drilling required.
AUSTIN REPRODUCTION PARTS LTD (Willie McKenzie)
Address: Unit 29, Glenmore Business Park, Blackhill Road, Holton Heath, Poole, Dorset BH16 6NL
Phone: 01202 625242
Fax: 01202 694351
Products: Zenith Carb Parts, Coil Conversions, Overtaking Mirrors
, to name a few of the high quality reproduction parts available. Visit our new website