Special ordered cars

Cars had model numbers as best as I can describe. all 1970 Dart Swinger 340's were coded LM23H0R. all 1970 Valiant Duster 340's were VS29H0B. the S just went with the model like all 1969 Dart GTS's had LS23P9 or LS23H9.

No other reason.

BUT!!!!! the 1971 and 1972 Dart swinger 340 Canadian cars were Y39 Special build like the Hemi Darts that were pulled off the line or the 6-pak cars .

These were limited run cars on special build dates