Here we have one genuine Lucas Dipping Mirror, production data 1958, New Old Stock still in the original box. The box is somewhat tatty, but the mirror is in mint condition. In March 2012 this sold on eBay for a whopping £340.00-GBP, $539-USD, with three bidders within 80% of that price. Hard to fault the bidding or the price, since this is the only one I have ever seen sell in new condition.

It always bugged me a little that the mirror above was either taller or narrower (or both) than the standard MGA dash mirror. Now below we have a picture of another Lucas Dipping Mirror more in the correct aspect ratio for MGA. Photo compliments of Derek Tucker. The correct Lucas Part is Type 585 Part No. 62046A.

These mirrors were fitted to some of the Abingdon Works Cars and as you say are larger all round than the standard mirror. It is best to use the standard MGA chrome mounting stem. The mirror size is 6 inches x 2.5 inches including the case. These mirrors are a lot more stable than the standard mirror with very little vibration.