I got mine from Advance Auto Parts. They had to order them but they came in like 2 days. $104

Just follow directions that come with them.
Un-bolt old ones, when bolting on new ones only use the lock-washer, leave flat washer off.
Then, disconnect the plug from the vacumn solenoid.

Only draw back is you have to get out and lock them in.

However, at least when you lock them in they are locked. On vac ones, if solenoid went bad, no 4x4. If a vac line broke or leaked, no 4x4. The manual are to me more reliable.
(unless you forget to lock them in and rolled backwards down into a tree. not me , friend in a nissan p/u)

Anyways, they will work for you.