That pack i got from walmart came with a whole bunch of metal end caps,but i shortened my throttle and clutch cable and sheaths without the metal end caps and still work great. Im using a brake lever for throttle and shorten the cable at the lever, the clutch cable was shortened at the clutch lever on engine. I don't like having 2 extra feet of cable for the throttle or clutch either.
So it don't matter if you put a metal cap on the end,but if you have one laying around or if you can reuse the old one go ahead.
My bike is from china, bike cables from china, engine from china, parts are as good as the installer.