Window lifter

Hello, I checked all my window lifters, about nine.
The rear ones are usually the ropes and hoses in order, only at the front two of the lower hoses are rusted.
Has someone ever changed these hoses, seal does not fit through the hose,
Window lifter I have one without function, have disassembled it, coal and winding in order, broken is a small bimetal switch that switches off the current in my view if you press the buttons too long or the window is too heavy.
Someone knows where to get this bimetal switch.
Greeting Helmut