Speaker size for 2000 Dodge Intrepid

Hey everyone! Been a while since I posted on here, but I have a question that I hope you can help me answer...so here goes!

A friend of mine has a 2000 Dodge Intrepid and she wants/needs new speakers installed. She just wants replacement speakers, i.e. she doesn't want components or a sub/amp. I have been doing some research on Crutchfield (just research, not going to purchase from there...I know this!), and there seem to be no speakers that fit directly. So, the actual question is what size are the door speakers in this vehicle? 6 1/2" or 6 3/4"? Or do I need to use an adapter/bracket to mount them correctly?

Thanks in advance for any help you can provide!