vintage-tyre supplier Moser from Austria offers the following sizes/brands:
(www.oldtimerreifen.com/reifen/diagonalreifen.htm)
5.00/5.25 - 16 Excelsior
5.00/5.25 - 16 BFGoodrich WW 60 mm
5.00/5.25 - 16 Firestone WW 60 mm
5.00/5.25 - 16 Dunlop
5.50 - 16 Dunlop
5.50 - 16 BFGoodrich WW 60 mm
5.50 - 16 Excelsior
6.00 - 16 Dunlop
6.00 - 16 Avon
6.00 - 16 Excelsior
6.00 - 16 BFGoodrich WW 90 mm
Munich-vintage-car-tyre-service offers the following:
(www.oldtimer-reifen.com)
5.00/5.25-16 L, Avon Tourist, schwarz
5.00/5.25-16 P, Dunlop C18, schwarz
5.00/5.25-16 P, Michelin Stop, Weißwand 50mm
5.00/5.25-16 P, Michelin Stop, Weißwand 50mm
5.00/5.25-16 P, B.F. Goodrich Silvertown, schwarz
5.00/5.25-16 P, B.F. Goodrich Silvertown, Weißwand 60mm
5.00/5.25-16 P, Firestone Vintage, schwarz
5.00/5.25-16 P, Firestone Vintage, Weißwand 60mm
5.00/5.25-16 P, Excelsior Avus, schwarz
5.50-16 L, Avon Tourist, schwarz
5.50-16 P, B.F. Goodrich Silvertown, schwarz
5.50-16 P, B.F. Goodrich Silvertown, Weißwand 60mm
5.50-16 P, Firestone Vintage, schwarz
5.50-16 P, Firestone Vintage, Weißwand 60mm
5.50-16 P, Excelsior Avus, schwarz
5.75/6.00-16 P, Dunlop C49, schwarz
6.00-16, Coker Classic, schwarz
6.00-16 H, Dunlop RS 5, schwarz
6.00-16 H, Avon Turbospeed, schwarz
6.00-16 L, Avon Tourist, schwarz
6.00-16 P, Firestone Vintage, schwarz
6.00-16 P, Firestone Vintage, Weißwand 80mm
6.00-16 P, Firestone Vintage, Weißwand doppelt
6.00-16 P, Lester, schwarz
6.00-16 P, Lester, Weißwand 100mm
6.00-16 P, B.F. Goodrich Silvertown, schwarz
6.00-16 P, B.F. Goodrich Silvertown, Weißwand 90mm
6.00-16 P, Coker Classic, Weißwand 80mm
6.00-16 P, Excelsior Avus, schwarz
"Weißwand" = white-wall-tyres
There should be other suppliers (e.g. in the UK) who can also order those brands.
Regards Jörg