I know that sometimes, a minor difference can lead to a different part number and the "won't fit" issue. Not concerned with A or B-body cars, just C-body cars. So, just curious, what's unique to the '65 vs '66-'68 C-body bucket seat foam? Other than the rh side with the recliner and headrest?
One advantage of using Legendary is that if it doesn't fit, you send it back. Not quite the same with an upholstery shop if it doesn't fit as it should.
Key thing on the referrals from cruise events and such . . . look to make sure what you're seeing is what you really need to happen. That's why I mentioned the "French Seam" way of doing the seams, as Chrysler did back then, which is different than what Ford or GM did. The vast majority of the trim shops will have common fabric/vinyl sources. If they have an old "Lion", "deLeo", or "Detroit" trim book (with the sample swatches and such for the OEM fabrics, with "industry numbers" for them), then you can possibly match the orig Chrysler items with their unique trim codes and pearl/metallic finishes (which vanished with the '74 model year vehicles). So, with somewhat shared sources for the upholstery, "quality of workmanship" will be what you're buying. If there's something you don't like, bring it up to them earlier-on. Good work is not inexpensive, but quality work can also be "value priced". You might also inquire at the local car dealers to see where they get their warranty upholstery work done as those shops will have to be capable of "OEM Level Qualty" work if they might replace a worn panel in a complete seat cover.
How different were the Canadian upholstery items from the USA models? Just curious.
CBODY67