Khan,
I had tried to install one of the Robb Mc pumps and was not able to do it with the engine in the car at that time. After installing a new engine with the pump installed I had no problem. I think that if you drained the system and removed the hose it would be much easier. Putting the hose back on is not bad. I know what you are going through.
Regarding the fittings you can get them at a hardware store. What you need is a reducer from 1/2" pipe to 3/8" pipe and go from there.
Mark 5481 & 5461
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