Well as the name suggests this turns HK-47's apperance to HK-50.... it doesn't change HK-50's apperance *yet.*

You can get it here (this is the info page, but can download it from here.) (http://files.filefront.com/HK47toHK50rar/;6212115;;/fileinfo.html) This is version 1

Updated already:
here is the description of the file: This will change HK-47's apperance to HK-50's and change HK-50's to HK-51's! It will also change HK-47's dialoge, minor changes, he will refer to himself as HK-50 now and the HK-50s as HK-51.
DO NOT PUT THE DIALOUGE FILES IN THE OVERRIDE, if you do it'll mess the game up and you will NOT be able to recruit HK

It is avalible here (http://files.filefront.com/HK47toHK50v2rar/;6212658;;/fileinfo.html#postcomment) This is Version 2

This is also avalible at http://knightsoftheoldrepublic.filefront.com/file/HK47_to_HK50;72732x#1074975)