Some zipper fixing hints..
Scrub with soapy water often to prolong life. Hit with silicone spray when clean.
When they're totally shagged replace with bigger grade zip (same as original rear windows) with cord + plastic zip handles (not metal) for pax & driver's windows or you get lovely metal rattling from the zips on the window frame when closed. Plastic with cord is sweetly silent.
You'll get a bit more breeze through the larger zips but they'll last longer
my 2c
