Read this on the New Life Canvas site:
http://www.newlifecanvas.com/cckw.html
Cab Top (open cab CCKW) US Style
American style cabtop designed to be used with metal braces (not included) between bow and windshield frame (over doorways); canvas weatherstrips for bottom of these braces are included; top has rollup straps at front and tie down rope at back; will work without metal braces, without doors.
I'm both happy and sad. They are the only ones to include the roll up straps (WeeBee webbing does not) but then they state that its for the late curtain with the metal strip over the door.
I have an NOS late style top and the metal strips are not something you can easily fab up. It would be great if they carried the early style 'floppy' top with the roll up straps.
NLC is where I got my seat covers. Good quality. Doesn't really have correct hardware for the seats, anyway.