I just replaced my stock mirrors with some carbon fiber ones that have the turn signals in them. so i removed me stock signals. now i was wondering how i should fill those holes.

You could buy a small sheet of carbon fiber and cut some covers. They might sell something like that on ebay. You could also just put a sitcker over the holes. Ive used stickers on body pieces that were scraped up, You couldn't tell it was even messed up.

Where did you get those mirrors from? How much? You got a pic?

can always go to a basic welding or machine shop and they can fabricate you something that is close to fit

I can't say I've come across a mass produced solution. I know there are block of plates for the mirrors if you wanted to remove them. Then there are flush mount turns from like Lockhart Phillips.

I'm a fan of the stickers. I would recommend filling the void first with like some Bondo so you don't poke a hole in the stickers. But I use stickers for all sorts of things. Cover a little rash, product endorsement, change of pace... you name it. Plus it's a very cost friendly solution.