I'm assuming that you want a curtain for the windshield. We made ours from upholstery material. I have an FLD120 cab. I decided against some kind of track pretty early. I installed snap buttons like a jacket has and they work great. There are screws holding the trim in the cab above the doors and windshield. I removed every others screw ans used it to secure the male side of the button to the cab. When I got the male sides attached I held up the curtain to the snaps to get the position of each female side. The curtain has about 10 snaps and installs in less than a minute. Works great.
1989 FLD120 with 2000 NRC conversion