Not WW2 period correct.
Anyways, I'm thinking that the "Mitas E-07 Dual Sport Front Tire 100/90-19" will be a great perfomer.

I see that "MX1 Canada" has them over here.

That's 4" wide and should be fitted to at least a WM3 and preferably a 2.50" rim....It's likely to steer like a tractor in reverse..will it even fit in ?

The same for me and it run very well ...

email (option): matrot.sandra@neuf.fr

MITAS 3.5

email (option): matrot.sandra@neuf.fr

Norton 16H is around 17psi front, much more than that and it shakes it's it's head violently. The old books warn on this very point

email (option): jeremy@clogmaker.co.uk

I run my 16H on 27 front, 30 rear. No steering damper and just a touch on the rebound. It has never, ever shaken its head...decent forks and spindles though.