Well, I'm trying to import a 2k10 headshape into 2k12, but just to see if I could get a 2k10 model to import into 2k13, I attempted it, again with no luck.  And just to make sure that it wasn't just the one headshape, I tried 4 different 2k10 headshapes with no success.  Again, I successfully imported a 2k11 headshape into 2k12 and a 2k13 headshape into 2k12, but 2k10 just doesn't want to work for me...  so, I'd like to think that I'm doing it right, since I have successfully imported them, except 2k10 headshapes.  Also, the faces, edges and vertices all match on the headshapes I'm trying to import--(the standard seeming to be ve: 1399, ed: 4065, and fa: 2664).  Its driving me mad, cause I created so many headshapes for 1992 MOD for 2k10...  this video gave me hope that I could salvage all of those 100's of faces I created...  sad is me