[Carphunter]

i was just looking for some other stuff for a different vehicle, but I think you probably want both an extended bar, and a raise. that way, you'll clear the bumper, and bring the ball up to the correct height.

But, at the moment, I can't remember the darn site that had a bunch of that stuff.

Etrailer has some, I don't see the length from hitch pin listed though (except for "standard," "long," etc.).

http://www.etrailer.com/dept-pg-Ball_Mounts-hs-Fits_1~1|4_Inch_Hitch.aspx