As your profile lists you as a 2000 model GC, the leds you need should be the same as my 99 WJ Limited.
The map lights and door lights are 194/501 wedge bulbs
The courtesy/cargo area are 214-2 (use 44mm Festoon bulbs)
The puddle lights (under the dash in the footwell) are also 194/501 types but I suggest you go for more leds to get good light.
The mirror lights are 31mm festoon (the only place I found them was 1pc 31mm Vanity 3 SMD LED (Xenon White) Fuse Bulb on eBay (end time 20-Nov-09 07:04:35 GMT)
on EBay - available in blue or white)
I also repalced the engine bay light (standard on 99 model) with an LED from Autolumination - I bought the 3W version (it's the flat one with 3 LED's near the middle of the following page Festoon Dome Lights
Hope that helps