'70 Dart: Deluxe Seatbelt Package?

The '70-'71 FPC lists a seat belt warning lamp, part number 2947 931, applicable for Dart and Valiant with no year differentiation '70 vs. '71. Other parts in the same type code group (8-37-75) do show differences between '70 and '71. It would not have been used after 1971; the 1972-up instrument cluster has a built-in Fasten Belts warning light.

It does not look as if the Year One part is correct for A-bodies, and the photo they show is also wrong (look closely at what the lens says…)