i was gonna pick up some new bulbs for my dome light and trunk light since im getting new led's for my dash on superbrightleds.com im pretty sure they come with 31mm x 10mm, but they only sell 30mm x 10mm on that site, so will a 30x10 fit in my dome light? i have a 1993 honda civic sedan.
-thanks!

 

As long as it's marked as a replacement for a DE3175, it's probably fine. It's a difference of 1mm. The little metal contacts that hold the bulb in will bend 1mm.

 

it's a 3022 festoon bulb

SuperbrightLEDs.com has good ones for really cheap. I prefer the 3022 4-LED one (under "LED festoon bulbs"). I tried to the 9-LED one and it sucked, didn't fit well under the dome light cover and it burnt out quickly. I've been using my 4-LED one for a while now. I would buy a couple of them if I were you and put one somewhere like your toolbox to keep as an extra.