I'm guessing the last true 15x7 trim rings 3461043 were going or gone from the system by 1976 or so, and the 3461022 before that.
In 1975 or 76 I ordered four 3461043 trim rings.
When they came into the dealership, 3 were the true 15x7's and one was a 15 x 6.5.
I never knew this until a couple years later when I went to use them on a car.
I went to the dealer and complained and they repeatedly ordered 3461043 but they all came in 6.5 so I just kept them.
15 x 6.5 rallye rims were on Charger/Daytonas, etc in 1975-6 and vehicles before that so they used the 15 x 6.5 chrome rings ( borrowed from GM Cutlass Supreme...exact same trim ring )
The 7 inch ones were phased out ( scrapped) because Chrysler was using the same part number for the 6.5.