ok, here is what I see, but I can not take any conclusion
there are ( with maybe C bodies exceptions ) on 70/71 period 3 KIND OF SWITCHES
2 thin walls, which are one diff from the other... one to be pulled out and the other one to be pushed out... IT SEEMS the push in says Flash on and the pull out maybe labeled hazzards
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one big squared was used FOR SURE on all 72 and laters models, and as far I have noticed some laters 71 models, however misteriouslly the 71 Barracuda Data page shows the later model
On thin walls knob ( earliers ) you'll find the column collar got a small cuout provision for the knob.
On big squared button, the column collar is totally diff with a big provision for it PLUS the cut out provision for the courtesy light. When this was not optioned, this provision was filled out with a plastic plug.
the courtesy light on earliers thin wall knob setup, is really small with the bulb INSIDE the column and somekind of small guide to get the light pointing out to the key. This is really small, and thats why the collar doesn't require the provision for it, but the blinkers knob got a depresion molden it giving some room for it... WHICH KNOBS DID OR NOT ( push or pull ) ? dunno, maybe all of them ?
On laters square knob, the bulb is practically outside the collar, and just a cap covers it, with a window to allow the light going to the ign key. Being this, a cut out is required and doesn't affect the shape of the blinkers knob.
is it posible the courtesy light option could affect on earliers setup being pulled out or pushed in ? DUNNO
but looking at all 70 PLYMOUTHS data book pages, all show pull out setup, and all 70 DODGES push in
this is JUST what I see, and can not take a conclusion