My gas fire igniter sopped working, appears part of the igniter metal "wick" has snapped off. I've done a job on it short term but I also think the thermal coupler is on it's way out. A new correct assembly form the orginal fireplace supplier is £60, I have found an almost identical one for £18 although the layout is igniter/therm coup/pilot, whereas I want igniter/pilot/therm Coup. The manifold seem simple enough to switch things around both thread and bracket fixings appear same. Question - are each of these componants same/similar or do they have specific ranges for specific fires?