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Maybe. I know that they had different part numbers according to the white book...

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According to the '68 Chrysler parts book, both gtx6970 and mopar70rtse are correct. It shows A & B bodies use the same motor and the variable speed / 3 speed as the same part#.

A quick Google search using #3004114 found 2 available (depending on your budget ).

NOS at $595 (enter 3004114 in the search box to save a lot of scrolling)
http://www.tonysparts.com/SearchResults.asp

Used at $225 (look for #813033 in the right side column)
http://www.collectorsautosupply.com/query.asp?section=WIPERS&year=0&make=Mopar+A+Body



P.S. Great looking car!