Hello 36tbird and Everyone else, appologies if I take this thread about tires and inject some stuff about mounts and covers, but I think it is relevant.
I just picked up my copy of the Swanberg and Rogers, '35-'36 book by the Early Ford V8 Club, and on p.91 it says "As in 1935, 6.00 x 16, 4 - ply non-script blackwalls were standard equipment on 1936 passenger cars, with double sided whitewalls and 6 - ply tires available at extra cost." Further down the page it says "In July of 1936, Standard model cars were equipped with 5.50 x 16 four ply non-script tires and the rim size was reduced from 4 inches wide to 3 1/2 inches wide. Whitewall tires were not available in this size."
I also located some applicable information on p.22-23. There were FIVE different spare tire mounts in '36 for the different slopes to the rear of the bodies. There were two spare tire covers, different by their locking mechanism covers, one flips open like a clam, and one swings on a pivot.
One of the covers fits the 6.00 tires and one fits the 5.50's. (I can't tell if there are different rings. Maybe someone knows if there was only one ring or two?)
It says that one of the mounts was for the Standard Coupe with 5.50's, and one for the Standard Sedan, also with 5.50's. (Confused again, did all cars come with the 6.00's, or did Standard cars come with 5.50's?!? Likely the dealerships would put whatever you wanted on the car to get the sale, so that could figure in here too.)
So I think it's back to the car with the book in hand, to figure out which spare tire cover you have.
I think I read it that if your car is a 'late '36' Standard, or possibly any Standard, it could have been delivered with the 5.50 x 16's, and the spare tire cover to match.
Hopefully some of this helps.
And thanks again to the V8 club, and Swanberg and Rogers (and everyone else involved with that book), it has been a great source of information for me and many others.
-VT/JeffH