Actually, he needs one of the YC22L style motors as they have a 2.3mm shaft for the metric 48P pinions the Vendetta uses.
He can use pinions made for the MLST. They are also 48P. In the picture of my Mega in my MLST you can see I the two pinions from the different motors. http://www.rc-monster.com/forum/atta...8&d=1204310439. The HP-YC22L-5000 would be perfect too with the pinions you mentioned.