anyone ever use these u-joints

[SuperDutyScaler]

first run out my son blew his u-joint's today. I haven't bout any axial or traxxas metal ujoints in at least three years andman have they went through the roof! So looking on Tower Hobbies i found these for a Traxxas villian, problem is they dont list the shaft size or wether they work with the standard traxxis plastic driveshafts.So anyone use um before? i guess for 4 dollars ican just take a chance.

http://www3.towerhobbies.com/cgi-bin...?&I=LXJD72&P=7

http://www3.towerhobbies.com/cgi-bin...?&I=LXGBH2&P=7