magnum manifolds

Trebling,
I was more interested in whether folks on the forum believe these would fit my 74Duster without complications. Anyone?
Your Information/link is below. The outlet size is discussed in a customer's question on this product at Summit's site. If you can't find it, the answer states:
"...Dorman 674-271 exhaust manifold has a 2.125 in. outlet diameter..."
I realize this answer might be referring to the outside diameter of the down-pipe that fits this manifold which would indicate an I.D. of closer to 2". I am O.K. with either dimension but will probably just submit a new question for clarification before I make a purchase.
-Scott

Dorman 674-271 Dorman Exhaust Manifolds | Summit Racing

Exhaust Manifolds 674-271 (Driver's side)
the Passenger side is# 674-270