Thinner door seal material???

[WinDancer]

Finally got around to my doors. They always required a much-too-hard slam to close fully, and that pressure AFTER they were closed made locking/unlocking with the key impossible.
Checked the door hinge pins and they are good and solid, no play up and down.
Removed the rubber bumpers- no change.
Removed the threshold plate, no change.
Removed the weather stripping from around the cab where the door closes- it now opens and closes normally.

Anyone got a decent source for much-thinner rolls of door seal material [with pics and measurements] ?

TIA,
Dave