Lets be up front from the start and you can chuck me off if you don't like commercial posters.
Pirelli have made a tyre that you might be interested in http://www.longstonetyres.co.uk/page/185-70vr13-pirelli-cinturato-cn36.html it is a 1968 tyre. but importantly it is a 70 profile tyre that was developed to suit cars like yours instead of being a modern tyre that turns out to be about the right size for you.
Lets be up front from the start and you can chuck me off if you don't like commercial posters.
Pirelli have made a tyre that you might be interested in http://www.longstonetyres.co.uk/page/185-70vr13-pirelli-cinturato-cn36.html it is a 1968 tyre. but importantly it is a 70 profile tyre that was developed to suit cars like yours instead of being a modern tyre that turns out to be about the right size for you.