Thanks for your input ChrisK
I would be purchasing new from alfredbekker
https://alfredbekker.com/product/indicator-extension/
https://alfredbekker.com/product/indicator-extension/
These are two very basic adaptions which they sell ( most they do not sell direct , as i assume the rest need a specialist installer) direct to the public and appear to be easy to fit by bolting/screwing on to the stalk and wheel