Thank you John, and thank you for the very kind offer of a loaner - I'll decline, last time I borrowed a part off a mate, I accidentally broke it!
The lotus one you've linked certainly looks correct (and I've read that the Elan drive does match the Morgan one) . The last one I bought from ebay had a slightly larger size quill, which was too big to fit into the gearbox drive. I contacted the company and asked if they had one with a smaller quill, but they said that the speedo cable attachment was different.
I think I'll take the plunge and go for the Lotus style one you've linked to. I found one that's a tenner cheaper from SJ Lotus- and £40 cheaper than the Burton Power and Speedograph options!
Last edited by TBM; 16/05/19 02:12 PM.