kit-locks for spare tire?
 

I bought this pre-owned pickup and it happened to come without anything to change a flat tire, at lease to release the spare tire.

I had a flat tire the other day and HAD to run on it all the way to a nearby shop to buy a new one, although my spare tire is still new, never used :((

need to buy something. the user manual says it's the "wag-nut" and simply looks like a hook with a square end. Pepboys says they dont have such thing so i went to a local dealer and they talked abt kit-locks (p/n f75z 1a380 ba) and it's abt $45.

is it a right thing to pay for that? or should i do smt else?

thanks guys.

ps: it's a regular cab 2000.