OK, here's the deal: only 1 10"/15" '65 Sedan was considered factory at the time (Flynn's Dodge by Branstner): the S&M sedan was originally an RO car converted partly by S&M & partly by Branstner. The '64 "2%" cars were actually a bit more than 2%, and several were built, in HT & sedan configurations. Those seem to all have been MW HTs or Hemi sedans. Dodges used the Plymouth wheelbase (1" shorter). Part of that deal was a lightened stainless K, which Chrysler later recalled from the teams.
For '65, only 4 "2%" HTs were built (2 Dodge & 2 Plymouth), one of which (Melrose Missile VII) was soon converted to a 10"/15" AWB.
The "2%" refers to the NHRA rulebook "fudge-factor" allowance of the time, which predictably was exceeded in typical racer practice!
No doubt parts were swapped among different cars, and of course many non-factory 10/15 cars were built fresh or from earlier MW/RO/WO ("A990") cars.