You could make use of a Motolita steering wheel which is the most common replacement in a Morgan, including a matching new boss. Motolita wheels are available in different diameter sizes. I guess that your 4/4 does not have the widest tyres and therefore a smaller diameter wheel should be no problem regarding the somehow stronger forces when turning or at least when parking. Subjectively I have made the experience that an at least slightly smaller wheel gives the feel of a roomier cabin. I have had a 2011 Plus4 Supersports before my recent Morgan. She had a bigger diameter wheel than standard and my ellbow was disturbing the co pilot sometimes a little bit.
