That's because their database is incorrect and they're only listing the sensor for the 3.0L DOHC.
If you have (or have access to) a second car, take the camshaft sensor off and take it with you. After they [again] say they don't have any listing for your car, ask for the store manager. Have the manager recheck, then check for a 1993 and 1995 ATX (none of which they'll find). Then tell the manager, "it's a Wells F134, and I brought the bad one to compare".
When s/he asks how you knew that (the F134) was the part, tell them that for some reason they only list the part for the 3.0L and not the 3.2L DOHC engine . . . . Then have the manager submit the problem (database error) via their email system.
Or if you really want to have fun
Before you go to AutoZone, go to/call Advance Auto, O'Reilly's, [insert the name of your favorite parts store] and get THEIR part number. When the AutoZone manager cannot find the part in their database, tell them, "[insert the name of your favorite parts store] has it and their part number is . . . ."
