I'm pretty sure the Kamino pack is a Boba one with a Jango paintjob, yes? If so contact BobbyFett UK or Man of War Studios. If not, good luck with your search
You attach it with parachute clips. Put the male end on the harness and the female end on the jet pack. Be sure to mount it high on your back, most people make the mistake of mounting it too low at first.
here is a link, if you look in post #42 you can see the clips. Also if you look at Seeker's posts he has a link to his flickr account where he has tons of pics of how to set it up.