Morris Minor Owners Club

hello morris friends, i am thinking of buying a steering wheel disklok for a friend who has a 1955 morris with the original steering wheel, he has spent thousands on his car and nothing on security! and i am worried that one day someone will nick it.
my question is what is the outside diameter of a 1955 morris steering wheel as disklok biggest is for 44cm wheel. Yes i know some of you are saying why dont i measure my own wheel,well my cars are not keep where i live, please help, Graham

I have a 53 Morris and have the half moon jobbie..fits perfectly...the full one didn't fit mine...

It won't stop anyone with a lift truck taking it away... And no-one will ask questions if they wear Hi-Viz jackets...... Chain it to a lamp post .....