importing only one of them its imposible i can guarantee you that. and the only way to do that is to import all the odd to 3ds max and edit only the head you want
(if you use 3ds max, you should know that the ped models need a skin modifier when you are exporting them and if you import them to max you will see that they already have that modifier, so you need to copy the modifier,convert to mesh or poly, edit the model and finally paste the skin modifier again, otherwise, wont work. if you didn't know this kind of things about 3dsmax you should learn before start to mod peds,if you did, great just follow my advise.)
dont ask if is there any other way, matter me, there is not other way to do that.
note:at the importing time go to the schematical view and set the "always arrange " mode, because model dictionaries may have hierarchy at the time of rendering in the game so be careful with that also.
This post has been edited by aacclapd on Wednesday, Jun 20 2012, 20:57