Dave I am leaning toward your Mohawk was probably his original Mohawk.Since you said it was like 15 or 20 years ago.Maybe Rob knows when the Sparrowhawk was introduced.The original Mohawk was a very nice bow as you know.
Anyway since your looking for something similar in that general style of bow I would look at bowyers websites who might build the mild R&D that strings into the classic D shape .Bowyers do make them.Not all.But you will find some that do.
A few that I have had are still being made.The Great Northern Critter Gitter,Dwyer Original Longbow,Wild horse Creek Destiny,St Patrick Lake longbows.J.D Berry might make one possibly?He used to make a few models like that.Thier are others for sure.Check the Sponsers list on T-Gang and look around at websites.