Looks like I stumbled across this too late with the kits no longer being available and JZiggy just running out too...
For people who have done this / handled these door checks before, what are your thoughts on converting a RH check to a LH one? I know they're different PN's and not directly interchangeable, but seems like the only difference between the sides is the orientation of that end piece "lug" on the body interface side of the bar - if you can remove that big pin and re-pin it with that lug flipped, it looks like that would convert a RH to LH or visa versa (am assuming they use the same piece parts but are assembled as mirror images).
My passenger side is pretty stiff so may just swap that with the driver's side one as a temporary improvement, unless I'm missing something.