ALL '91-'97 trucks take the D35 wheel bearings (Timken SET-37) regardless of axle.
This is one of those persistent errors in the chain store's computer lookups that no one seems interested in fixing (if your '94 happened to have the D28, the only parts that are different from the D35 are contained within the differential housing itself, plus the two inner axle shafts that enter into it). Brakes, knuckles, spindles, ball joints, u-joints, wheel bearings are all the same regardless.
If you want to simply avoid this headache for any front axle parts, tell them you have a '94 Explorer (w/o ABS).