no EGR valve?

i heard that some of the 4.0L's from 93-94 didn't come with EGR valves? why would ford do this? i've been wanting to replace mine for a while now and i went into Car Quest and bought one for a 93. I've looked everywhere under the hood and i cant find anything that even looks remotly like this valve. has anyone heard anything about this? any help would be greatly apprieated.

thanks
Tyler