I no longer have a '64 Canadian FPC. If your FPC lists VX cars, that's a Canadian book (paper? Or PDF?)
The US '64 FPC shows 1942 401 for the 6-cylinder cars, 2205 080 for the 8-cylinder cars; everything from Dart-Valiant 'with heavy duty transmission' up through Imperial. This makes me suspect the 2205 080 is for A727 transmissions, and we already know the 1942 401 is for pre-'65 A904 transmissions. Listing the '080 for 8-cylinder Dart/Valiant cars might be an error in the '64 US book; those cars got A904s, not A727s.
Canadian '60-'63 Valiant-Lancer-Dart FPC shows 1942 401, only.
Highest likelihood is that you need the 1942 401.
2464 482 appears only once in the US '64 FPC, as a component included in auto trans gasket/seal kit 2495 091, which is listed as the kit for 8-cylinder Valiant-Dart cars. It is not listed separately as the rear seal for the automatic transmission in those cars; again, that's where 2205 080 is listed. The 2464 482 seal is even larger in diameter than the 2205 080, so…yeah!
The only automatic transmission difference between US and Canadian '64 A-bodies was the Canadian Slant-6 cars used a different ring gear (same as US '60-'61) to comport with the Prestolite direct-drive starter vs. the US gear-reduction item.
1942 401 specs are here.
2205 080 specs are here.
Should be easily obvious from the specs (shaft diameter, outer diameter, etc) which one your car needs.
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I didn't yet have a sheetfeed scanner. Now I do, and it's an amazing thing – take a parts manual (or similar) to a printshop and have the spine/binding sliced off, then the scanner will turn it into a good PDF with like 10 minutes' work.