Exchange thermostat housing

I'm using the GBS water rail, so the OEM thermostat housing comes off and is replaced. For now just the right angled tube itself incase its harder to get at once the engine is in the chassis. The thermostat housing bolts to this from above so I can leave that until later.

A little feature of the gasket, that top arc which should be around the top right mounting hole is actually cut to the left by a cm or so. Trimmed it with scissors after this picture:

3x hex head bolts supplied with the kit, loctite in place & holes taped. Spider ingestion is just as likely as dust in my garage:

Update -  Reference Paul's build for some advice on cleaning the mating surface between the  water rail adaptor & thermostat housing. Reference my later re-assembly for the mating surface between the head and water rail adaptor