Im sure this question has been beat to death. But when I searched, it just kept searching and searching. So I gave up.
Will M3 corners fit a normal 3series?
Sorry if its a repost and thanks in advance.

As long as you buy them for 2 door or 4 door. That's what matters. i.e. you have a 2 door, ///M 2 door corners fit.
~Phil

Cool. Thank you.

What's the difference between 2 and 4 door corners?

What's the difference between 2 and 4 door corners?

2dr corners "sweep" back further into the fender:

http://img257.imageshack.us/img257/7827/ambercornersyo2.jpg

4dr corners are "shorter" in comparison in length:

http://img102.imageshack.us/img102/1476/cornerlightstt3.jpg

Which ones would a Ti need? If it didn't say compact?

not 100% sure but I think Ti's use the same corners as a sedan.

Coupe and Convertible use the same. Ti/Compact, Sedan and Touring is the same Front.