It might help if you gave a bit more info than "errrr, where does this go"
The other kit that had this problem was a 4 piece kit, you claim your is a 5 piece kit. Where have you fitted the other 4 pieces?
There are only 4 main hoses that get replaced, the only other hose really it could be is the brake booster hose.
If its not the overflow to radiator hose then try it on the brake booster, but it looks a bit long for that