While out at the Spring Fling show, I picked up a '71 GTX that is coded J68 for rear window louvers on the broadcast sheet and fender tag, but they are not listed on the window sticker (original). The car was built in Los Angeles. I didn't notice any holes drilled into the roof or Dutchman panel, but I'll go over it better when it arrives here in NY. I'm wondering if they weren't put on, or if the car was mis-coded? The fellow that I bought it from had no idea that it was coded for them.