Which model have Autofit script with them?
I know of the Gen 3 (which has saved me a lot of time :D but I was curious if there are or will be others?
I hope I understand your question right, you want to get clothing items for different characters to fit the Genesis figure?
If that is the question then the Genesis Iconic Shapes is what you need.
This here is one of the best things I have purchased from DAZ http://www.daz3d.com/shop/gen-3-iconic-shapes-for-genesis
It adds Victoria 3, Michael 3, Aiko 3, Hiro 3, Stephanie 3 and The Freak to the Genesis figure, not only can you use their clothes you can actually morph Genesis to become each of these figures.
I hope that helps.
Sadie and Sam, which just came out today, have autofit clones.