Help on command install parts???

so, I searched in the forum and I also saw here: http://home.earthlink.net/~phdwebsite/COMAND%202.0.htm
The parts I reached up where:
comand 2.0 A203 827 36 42 (up to 9/2002) (don't know wich one)
or A203 827 52 42
mounting Bracket: ??? (its needed?)
gps antenna A203 540 70 06 (without aerial A230 820 08 75) (don't know wich one)
c1 connector: ???
c2 connector: ???
Adapter loom: ??? (its needed?)
wiring harness: A203 540 09 09 (its needed?)
aux cable: A203 540 6107
instrument cluster removal tool:???
(correct if rong please)
I'm a little bitt confused, my car is a 4/2003 C220CDI sport coupe and I don't have aerial antenna ( I think this is the same as the phone antenna in the rear windscreen??)
Do I need anything else?
Note:
US cars have some differences from the Euro ones!!!
Thanks for the help



