‘99 Mercedes E55 Bose system questions

Hey!

I’m looking to upgrade the sound system in this vehicle and was wondering if anyone here had worked with a w210 with the bose system and had a diagram? I’m having difficulty getting correct info. Even Crutchfield isn’t straightforward.

The current set up is as follows

1” tweeters in the a-pillar (not in the dash) 6 1/2” in the front doors 6 1/2” in rear deck

I’m getting conflicting info on what size/type of speakers are in the rear door.