e39 FSU or Final stage Resistor

Wanted as above the resistor for a e39 1998 520i. The heater in the car only comes on some times. Don't know what is wrong so might change the FSU and see what happens. I need a fully functioning one not one like mine that was taking out as it was faulty.

Pretty sure med5 has one

Mine went last night too (well I hope that's what the problem is). Think I'm goin to go new, Micksgarage have a Febi one for €76, GSF are around €83 for Febi as well or around €50 for a cheap one.