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I managed to find and decoded the VIN information on this example. According to the 1999 period Ford F-Series brochure, it includes the WS (Work Truck) series which it is below the XL trim level. I believe it does applied to these previous model year 
1997 Ford F-150 Regular Cab Fleetside/Short Bed (Observe):
1997 Ford F-150 Regular Cab Fleetside/Short Bed (Script):
1997 Ford F-150 Regular Cab Fleetside/Short Bed (Observe):
1997 Ford F-150 Regular Cab Fleetside/Short Bed (Script):
