Wow, I thought this was t4r.org, not Pirate4x4. Let's play nice, ok?
Eagle_Dad, you are looking for festoon replacement LED's. Ours are 31 mm, anything larger will not fit. I would not purchase off superbrightleds.com if you are looking to save money, Amazon has them for much cheaper if you are ok with waiting for shipping (most come from mainland China). You are looking for something like this:
A quick word on SMD LED's (which is what most auto replacement bulbs are). There are three factors to look for:
Color Temperature (measured in "K") - 6000K is the the blue-ish white color that's most common for LEDs. You can find warm white LED's in the 3000K-4000K range. Your standard indoor light bulb is around 3000K.
LED type - There are three main types, 3528, 5050, and 5630. The numbers are actually the size of the SMD's, a 3528 is 3.5mm x 2.8mm. Smaller is not always better. In order of brightness, the 3528 are the dimmest, 5050 is brighter (the ones in the picture are 5050s, as evidence by the square size) and the 5630 are the brightest. That being said, I have 3528's in my Pickup and they work great. I just ordered 5630's for my 4Runner cargo area though since I want lots of light back there.
LED quantity - Obviously more is brighter here. However, don't get thrown off thinking 9 3528's are brighter than 6 5050's. It takes 3 3528s to equal one 5050, and 2 5050s to equal one 5630 (or 6 3528s).