For that correct R-Model look, we offer these reproductions of the original extruded aluminum side window frames as installed on the original 1965 Shelby GT350 R-Model race cars. Fits 1965-66 fastback bodies only, updated to fit better than the originals but will still rattle and whistle. Designed for the vent window to be fixed in place, while the side window can be lowered via a 2” web strap. Some fitting required. Plexiglass side windows are sold separately as 2 vent windows & 2 side windows, 1/8” thick, ready to install (may need slight trimming). Combined, these side windows and frames weigh about 25 lbs less than the stock components. Plexiglass windows sold separately (R-Model Side Windows, set 4, Plexiglass (Part # 100-350SWPG)).