I remember answering this before.
I would try one of the rebuilders.
Lares, firmfeel or anyone else.

I tried to match up the o-rings when I thought the box I bought didn't come with them.
found them zip tied to the box but painted the same color so I missed it.

I am guessing they have them and might sell them too you pretty cheap.

might also be this
http://www.partsgeek.com/2lyhcfq-dodge-c...+Valve+Seal+Kit