From what I understand, Art has options and signature series on most of it's models. If you don't have the signature version, it wouldn't be too difficult to upgrade to the same value Jensen caps. Probably SOL on the exact Jensen film inductors.
Speaker City, near Granville Island, can handle the cap upgrades. They used to do things like that. Commercial Electronics and even Space Tech (Rupert & 2nd) could be other options. They might just recommend just paralleling ("bypassing") the existing caps with eleotrolytics. Depends on what you're trying to achieve. Ask to talk to the tech, not just the clerk.
Speaker City, near Granville Island, can handle the cap upgrades. They used to do things like that. Commercial Electronics and even Space Tech (Rupert & 2nd) could be other options. They might just recommend just paralleling ("bypassing") the existing caps with eleotrolytics. Depends on what you're trying to achieve. Ask to talk to the tech, not just the clerk.