John, sorry I missed it when you first asked your question (I had to go help my mother who broke her leg in 3 places and was away from a computer for 3 weeks )

Anyway, I'm not sure where to look for them but they do make fittings that are 1 1/2" mpt with a 2" socket on them - I guess you'd call them a reducing male adapter - They would be great for your situation or wetviking's

Again, sorry I didn't see this when you needed this info but, hopefully, it will help others.