I am thinking of replacing the interior lights with blue led. What size bulbs would i need.

 

i think 168. i got 921 bulbs from Tec-Toyz, it has 9-LED in each bulb and will fit 168.

 

For the courtesy door lights, map/reading lights, trunk lights and license plate light the bubl you are looking for would be 194 or 168 (both of them fit, they are the same).

For the dome overhead light you are looking for the 3175 festoon bulb.