Heater Hose, Caliper Bracket

1996 Buick Regal, 3.8L engine:
1. Either at the firewall or the engine, which heater hose is the supply and which the return?
2. Does the bolt retaining the caliper bracket require
a Torx T55, T60 or some other type of driver?
Thanx in advance for any assistance.
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Thanx for your response and information.
I'm not familiar with the Thermo Housing item unless you're referring to the thermostat housing, which would appear to be on the top rear (driver side) of the engine at the base of the upper radiator hose. The heater hoses connect near the left (firewall) front (passenger) side near the top of the engine.
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