Knee Dart Question

[Cameron]

Im doing an ESB BF and Im confused on the proper Knee Darts. Should they have the grooves or be smooth at the ends? Ive seen them for sale both ways.

 

[redkraytdragon]

Sorry for the necro post, but I was wondering this myself after I read it.
Good question. I THINK they were only used on the ROTJ SE, but I would defer to Rafalfett if he knows.
My answer is based on this gallery photo and the description beneath it. I just don't know which knees those are.

http://www.thedentedhelmet.com/gallery/art-of-star-wars-2002-08-19/p7224-boba-fett-costume.html