Here's some more info....
www.superbrightleds.com has replacements for the stock bulbs....here's the list of stock bulbs...for a 99 that is.
1999 JEEP Cherokee
High & low beam headlamp
H6054
H6054ST Silverstar High Performance Lighting: The Whiter and Brighter Halogen
H6054XV XtraVision Halogen - The Brighter Light
H6054CB Cool Blue Halogen - The Whiter Light
H6054LL Long Life Halogen Upgrade: Lasts 6x longer
Parking light
3157
3157LL Long Life Upgrade: Up to twice the life of the standard lamp
Front turn signal
3157
3157LL Long Life Upgrade: Up to twice the life of the standard lamp
Rear turn signal
3157
3157LL Long Life Upgrade: Up to twice the life of the standard lamp
Tail light
3157
3157LL Long Life Upgrade: Up to twice the life of the standard lamp
Stop light
3157
3157LL Long Life Upgrade: Up to twice the life of the standard lamp
High mount stop light
922
Fog/Driving light
H3-55W
H3ST Silverstar High Performance Lighting: The Whiter and Brighter Halogen
License plate
168
Back up light
1156
1156LL Long Life Upgrade: Up to twice the life of the standard lamp
Front sidemarker
194
194LL Long Life Upgrade: Up to twice the life of the standard lamp
Rear sidemarker
194
194LL Long Life Upgrade: Up to twice the life of the standard lamp
Ash tray
1891
Glove box
194
194LL Long Life Upgrade: Up to twice the life of the standard lamp
Map light
561
906
912
Dome light
561
Step/Courtesy light
168
906
Trunk/Cargo area
561
Under hood light
105
Instrument-general
53
658
74
Automatic transmission indicator
658