the change in the bezel (additional WIPER & HEADLIGHT symbols) was for model year 1974
from the Parts Catalogs:
8-37-90 BEZEL, speedometer & instrument cluster
Plymouth & Dodge B-bodies (RW)
rallye:
w/radio
2985 158 (1971-'73) & 3592 686 (1974)
w/o radio
2985 157 (1971-'73) & 3592 685 (1974)
Here's a picture of the part number on mine, the same part number as the one listed on page two of the for sale section here which does not have the indicators. Maybe there's another number on mine I missed? I'll have to check. FWIW, I still think your right about being a later application. Just not sure about the possibility of a late 73 application yet.
