Sorry to keep beating this horse, but can an "RU23" be a Roadrunner? All of the fender tag decoders say this is a Satellite/Belvedere. Most of the Roadrunner Hardtops have an "RM23" code. This IS a really base (Low) option car, no options other than the chrome drip rail moldings. And to my knowledge, there was no way (other than a Roadrunner) to get a hardtop, bench seat, 383 4barrel, 4 speed
(from mymopar.com's decoder)
RU23:
Plymouth Belvedere,Satellite
Unknown
2 Door Hardtop
H9G: 383 330HP OR 335HP 1-4BBL 8 CYL
1969
St. Louis, MO, USA
123801: Sequence number
E63: 383 cid 4 barrel V8 H.P. 335hp
D21: 4 Speed Manual Transmission
T5: Copper Metallic Exterior Color
H2T: Trim - High, Vinyl Bench Seat, Tan
T7: Dark Bronze Metallic Int. Door Frames
916: Build Date: September 16
159258: Order number
M21: Unknown Top Color (I've seen this code listed on other decoders as chrome drip rail moldings)
END: End of Sales Codes