I have an 07 Civic EX and I want to replace the bulbs in the map lights/dome light with LED's.

I know the bulb is DE3175 but I need to know who many millimeters the LED should be??
(ie: 31mm, 36mm, 39mm, 42mm, or 44mm)

Any help or guidance would be appreciated!

 

http://www.oznium.com/led-dome

 

Thanks... those look cool, but they're a little more than I wanted to spend. I just need to know how many mm the original bulb is?

 

You mean for a regular led or te stock bulb that in there?

 

Autolumination has a bigger selection, but also it shows you what your bulb looks like, in your case the 3157 is 1-1/4" LONG (31MM) X 1" (24MM) WIDE Replaces: 3022 3021 3175 6428 6430.

Now you can use one of those units from autolumination, or you could check around on ebay, I found this unit:

I've got a similar set up in my dome lights in my civic (modified two pair of three 1wat led 7440 led replacment units into a dome light equalling 6 1wat led chips as this unit is), and I've got alot more light than with other set ups...