Biltek FULL COMPLETE CAR TRUCK 4 WINDOW AUTOMATIC POWER KIT WITH 7 SWITCHES KIT Amazon product
I guess that link is unavailable. This is the same company and if you go to the "frequently bought with" they have the locks.
Regulators stay in the door. My fronts have no issue. The back windows are slow. I keep lubing the crap out of them but I think I have a lot of crud making asphalt out of the lube and dirt mixture.
My driver regulator would not keep my window up. Because of the gear and motor being a worm style in the window it will not go down on it's own so now I don't have that issue. Probably cheaper than sourcing a good regulator.
I think the kit states 15 lbs of resistance. Maybe measure that on your crank to see if its worth it.