Waaaaaaaaaay back in the mid '80's, I had to fix the signals on a '68 Cougar. The mechanical motor/contact thing was totally junk with no hope of coming back due to a "ventilated" trunk floor and parts at the time were made of unobtanium. It was way pre-internet and repop parts for Cougars and, any scrapped Cougar's that would have had a POSSIBLY good unit were long gone from the salvage yards already. So,,,,,,,,,,,,I wired it up so the brake lights were the center and inner bulbs and the outers were signals. Had to wire in 4 separate flashers. Two for the rear and two for the front. Could have gotten by with one flasher per side with a bunch of extra wire. A flasher for each light was easier and quicker. What do you know, it actually worked
On my Aspen, the blank isn't a reflector, it was just a lens and reflector with no provision for a bulb. The reflectors are in the far outer ends of the lenses. Always bugged me. Thought it made it look like there was a burned out bulb on each side. When they eliminated the amber signals, they used the same reflector housings except the former signal spot is molded shut, more or less.