As an alternative for back support you could try one of these http://www.sisseluk.com/model/uk/en/c-sl...sissel_grey.php

I bought one from: http://www.backpainproducts.co.uk/in-the-car/sissel-dorsaback-car-114-53-233.php and was very impressed.

You might want to have it retrimmed in the same material as Morgan will use for the interior.

Cheers

Mark