Don’t know of any conversion sets, but it can be converted. I converted a Revell 1/32 from a D to an N model some time ago. I carved a new nose blank and the new engine cowl blank and Vac-formed new N model pieces from them. It wasn’t too difficult. Here is the end result:
Hi osjohnm,
Granddadjohn is right: maybe you’ll have more luck in finding the Heller Kit.
Some years ago (in the days before the 1:48 UH1N kits) there was a Cutting Edge 1:48 UH1N conversion set, consisting of a resin engine housing, resin upper nose and vacform lower nose. I did two of those that turned out OK but I don’t know if the sets are still available.
Good luck!
Gertjan
What those guys said. The nose is longer and sleeker with smaller chin windows, the engine housing completely different and the rotors have a shorter chord. Keep checking the hobby shows and e-bay.