provided the bladder is the same size or a fraction larger it should be fine.

option 1.. take off the one pump tube and pull out the bladder, lay it flat over the orange u-stik. then take a texter and mark where the nipple needs to go, then stick the new nip on the new bladder (no hole needs to be cut yet. you do this with the pump). put it back in the kite. then before you re-attach the one pump tube put your pump into the new nip and pump til the new orange bladder pops a new little whole.... waaalaaah new bladder done.

option 2..(if old bladder is good and only leaks around nip) boil the kettle, put hot water in cup put ss bladder nipple area in the cup o hot water, wait till glu goes soft, remove nip wipe clean with alc wipes proved in nip pack, then find a flat serface to rest the dry clean bladder on and stick the u-stik nip into place. take a shooter glass and plass it over the nip press hard to be sure you get a good bond between bladder n nip...

hope these tips help.
peace and good winds
Pos