Hi Keith (Burgundymog) get in touch with Keith at Brands Hatch Morgans on 01732 882017 they have a stock of most Morgan batteries and they are at a very good price.
BHM will have you sorted out in no time at all, they are a very good dealership and helpful to the highest extent.
I put a thread on here earlier this year with the same problem as yours and Keith took the trouble to call me on a Sunday with a solution. What a good team they are.
Good luck....
Rob.
