I always wonder why repop parts often don't fit like the original. First attempt, windland "Made in Thailand" loose in tracks on cab, kept falling out during install. Second windlace "CounterParts" seemed very quality but very inflexible, couldn't get to fit in the corners. Third purchase came from Classic Parts, fits right, went in without much difficulty.
I adjusted the tracks in the cab with homemade tool and lubricated with soapy water. Once I got a repop windlace like the original (but black), this job was almost fun.