Don't know if this has been posted before but thought it would be helpful. I can't vouch for the accuracy of the data but it is listed as being for a 96 F250 on the Sylvania web site
FORD OBS LIGHT BULB REFERENCE
BULB LOCATION/ BULB NUMBER
High & low beam headlamp 9007
Parking light 916
Front turn signal 3157
Rear turn signal 3157
Tail light 3157
Stop light 3157
High mount stop light 922
High mount stop light 921
Fog/Driving light H3-55W
License plate 97
License plate 194
Back up light 3156
Front sidemarker 194
Rear sidemarker 194NA
Ash tray 161
Glove Box 161
Map light 105
Step/Courtesy light 912
Step/Courtesy light 561
Step/Courtesy light 89
Trunk/Cargo area 922
Trunk/Cargo area 906
Under hood light 912
Instrument-general 8605
Instrument-general 161
Instrument-general 194
Check engine indicator 194
Hi-beam indicator 194
Seat belt indicator 194
Brake warning 194
Automatic transmission indicator 194
Directional signal indicator 194
FORD OBS LIGHT BULB REFERENCE
BULB LOCATION/ BULB NUMBER
High & low beam headlamp 9007
Parking light 916
Front turn signal 3157
Rear turn signal 3157
Tail light 3157
Stop light 3157
High mount stop light 922
High mount stop light 921
Fog/Driving light H3-55W
License plate 97
License plate 194
Back up light 3156
Front sidemarker 194
Rear sidemarker 194NA
Ash tray 161
Glove Box 161
Map light 105
Step/Courtesy light 912
Step/Courtesy light 561
Step/Courtesy light 89
Trunk/Cargo area 922
Trunk/Cargo area 906
Under hood light 912
Instrument-general 8605
Instrument-general 161
Instrument-general 194
Check engine indicator 194
Hi-beam indicator 194
Seat belt indicator 194
Brake warning 194
Automatic transmission indicator 194
Directional signal indicator 194