No, just the "nut". I ahh.. stepped on it....
Did ya hear that, Doc? He said he stepped on a nut. hee hee
( grins )
Okies, so... you're swapping out parts and you can't get to the store for another cable to replace it?
Give me a sec, i'm sorta slow...
I think ifn it were me, i'd take the new cable back to the store and be friendly and such with the sales guy and explain you want another to swap out. Tell him the truth, too, and don't forget your receipt. ( Truth always makes people laugh and puts them in a good mood ).
Now, in the case that he says something corny like... well mister, that just your tuff damned luck, then remember where your gun is for a moment, then dismiss that from your mind, head to the other store by the same name ( AutoZone? ) and this time LIE.
If that all fails, or if you can't get to the store because you have no more wires, then take the old part and put it back on the bike with a repair best you can, ( as William suggested ). But basically, the only reason for the nut is to supply tension on that wire. So i presume you bought it for aesthetic looks or because the old ones are starting to glow in the rain... ( been there, don't ask what happens ).
Spark plug wires are basically thin with LOTS of insulation because of the high voltage. So, just adapt that to what you know already.
Hope i got the picture correct. But ifn you must use the new wire with the busted nut, take the old nut off the old wire and repair.