72 and later marker light welts?

Here is the 1972 parts book calling for 4 welt’s - notice only under the “L” body style! I have photos of 2 door, & 4 door darts with build dates throughout 1972!
My 1972 Dart Swinger Canadian Special 340 plus my Parts car had some on them as most parts were stripped as my 72 was found in a snow bank in Winnipeg.

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