Hi Geoff

May be worth a call to Brands Hatch Morgan, I have found the very Knowledgeable and helpful.
I also know that the have some Morgan parts reconditioned, so they may be able to help.

http://www.morgan-cars.com/

May also be worth a call to these, Local to us and bee in the re manufacturing business for many years

http://www.powerracksdirect.co.uk/

Cheers Aidan