Hey all, I'm gonna upgrade the stereo in this '88 626 I was given.

Just to confirm, the speakers in the front are 4" and the rears are 6.5", correct?

Is there anything I should know about as far as removing the factory stereo is concerned? Such as, will interior lights stop working or power locks, or anything like that..

I know it's a rather strange question, but I ask because my uncle replaced his factory deck in his '98 Civic and his overhead light and keyless entry no longer work... so just wanna be sure.

Thanks