I ordered mine from a dealer and you will get two, one for LHS and one for RHS. In my case it was my RHS one that was broken so I only replaced that one. Hopefully I will not need to fit the second one.
I got my heater fixed with the man in toome. I supplyed the kit and he fitted it.I was going to complete this myself but after reading reports of other people trying to fix this them selfs I decided this was the only way to go.He is worth a call trust me.