Ken;
Hi!
Winterketten on a IV-G at Kharkov?... Yes. Where to get them... I would get some from one of the DML StuG III kits which have them (or from folks who may have those Dragon tracks and may want to sell or trade them). Probably would be at least as cheap to simply buy one of those StuG III F8 or Pz.III N or StuG III initial w/ winterketten kits and swap those tracks for the set you have in the IV-G - cheaper I think than buying a Fruil set. If you did this, you would have a nice StuG or Pz III N kit with standard tracks.
Just a suggestion! In fact, I am planning myself to get one of those later IV-G kits with schurzen and fit some W-K onto it from a Pz III N kit...! I'm not sure that I'll be claiming it's a "Kharkov tank", but it will be a "Russian" fall-winter tank!
Bob