your stuck with 84-89 in your model. wagon only. 4x4 doesn't matter. still there aren't that many of those around anymore.
EDIT,
FYI
it's not that big of a deal. you can take most any (similar mounting-speed) blower motor and drill new holes for the bolts if needed, seal with rtv if it's slightly smaller. the basket needs to fit and turn is all. then deal with the electrical connection. i have a nissan blower on my 76 chevy pu. blower motors aren't that high tech. at least not in the 80's.
www.rockauto.com