http://www.team-durango.com/part-inf...artNo=TD330312
http://www.team-durango.com/part-inf...artNo=TD310135
Or
http://www.team-durango.com/part-inf...artNo=TD310226
Ideally you want these on the front as well so you can run 14mm hex wheels all round. I do believe the old style wheels have been discontinued.
You may not need the pins depending on what you already have but for just shy of £2 it wouldn't hurt to have spares