there one peice comes with special socket

 

Was looking at those myself, if you get them let me know if they are decent quality.

 

I got some like that at Advance a few years ago for $5 on clearance. They said they were $15 so it was a pleasant surprise when they rang up to be $5.
They're all pretty rusty now.
I had about half of my original caps left on mine. I took some welder glue one day and ripped the remaining caps off then shot the glue in there and shoved them back on and that held them on but I couldn't pass up the deal I found on the new ones.