Following a query by Doug and not wanting information to get lost in a ‘wrong’ thread, these are my thoughts on a radio for my 140DHC.
I have purchased a fifties Radiomobile in decent but non-functioning condition on ebay. The plan is to get it rebuilt by one of the modern restorers/converters to give FM etc. capability and possibly a plug-in music option.
Examples:
https://www.tadpoleradios.co.uk/Restoration.aspx
https://www.joesclassiccarradio.com/Resto.html
…there are, no doubt, others.