Stewart, here is a pic of the mirror made from two mirrors, it is reasonably vibration free if you can say that about a Morgan. It is 130mm high, and as i have said it needs to be that to see through (my) rear hood window. As it is not adjustable for rake it will not collapse at 60mph as did the original, (it will stay in Plaice) It is sitting on a PVC pad stuck down with automotive ds tape. Ideally if you can find one to go to the height that suits you it will save tiddling about.
regards john k

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Mirror Mount

1993 T16 +4 Lancia Blue.