I found all the wires I need to tap into:
And thanks to SubZeroe46's diagram and list it will be easier than previously thought
The M gearknob (I'm not exactly sure if it's M3 or M5 or both) wiring is as follows:
Pin1 (white wire): "R" indicator
Pin2: "N" indicator
Pin3: "D/S" indicator
Pin4: 0V/Ground for parking/driving light illumination } dim lighting
Pin5: +12V for for parking/driving light illumination }
Pin6: +12V for the brighter "R", "N" and "D/S" indicator
X1599 is the big white connector:
Pin2: brown wire (not to be connected)
Pin3: red wire
Pin4: orange wire
Pin5: yellow wire
X1193 is the small white connector
Pin1: grey/red wire
Pin2: brown/black wire (ground)
X1600 is the small maroon/purple connector
Pin1: blue/white wire
Pin2: red/orange wire
X1599, X1193 and X1600 all these connects to the underside of the gearlever faceplate.
And the ones I need to switch to make my 1998 to 2001 E46 m/s + and - upshift/downshift pattern flip to match the - and + upshift/downshift pattern on 2002 to 2005 E46 cars and the pattern on the knob.
Thanks for your help and will be sure to get this DIY by next week.