Are 66's mistakenly lumped in with 2nd gen darts by parts manufactrers?
…is the correct answer to this question.
Depending on what parts we're talking about, the grouping could be '60-'65, '60-'66, '60-'72, '62-'66, '63-'66, '64-'66, '62-'72, '65-'72, '66-'72, '60-'76, '73-'76, '74-'76, '75-'76, and a whole bunch of one-year-onlies. Within all those, it could be all A-bodies, all Darts but not Valiants, all Darts except wagons, all Valiants plus Dart wagons, etc.