I’ve been corresponding with Dan today on this subject - I’m sure he won’t object to me sharing the following:
We at SSL helped BCC (British Classic Car Spares) put together their comprehensive range of leaf springs. We therefore allowed them to include our ASYMETRIC Morgan designs.
BCC carry stock of both OE and our asymmetric springs. They are £253.11+VAT per pair.
I’m sure they’ll be able to help.