vacuum shift fork

I was just wondering if the shift fork in the dana 30 for the disco is a dealer only part b/c i looked at napa and o reillys online and didnt see one at all?

im asking b/c mines broke and i need a new one for the 4x4 to work b4 i get snowed in again lol.

i have 90 xj 4.0
i searched the forum and didnt find what i was looking for either.

I know quadratec sells it but it is on back order right now:
http://www.quadratec.com/products/52430_00.htm

Also 4x4 posi-lock sells a cast one that is supposed to be more durable, but it is much more expensive:
http://rustysoffroad.com/mm5/mercha...tys&Product_Code=PSL100&Category_Code=4x4POSI

I just picked up a new one from the dealer, they had to order it but had it next day, cost about $40.