OK, here 'tis
The Parts Book for my 2005 LC4 Adventure EU/AUS model lists part:
600.11.074.000 START-STOP SWITCH/LIGHT SW. 03 (START NOTAUS/LICHT EIN-AUS 03)
This is the complete switch block with wiring back to the connector, item #42. By cross-referencing in Munn's fiche, that returned the (USA?) 03 LC4A and the 06 EU/AUS/UK Adventures.
Interesting... I then drilled into the USA (presumably) 2003 LC4 Adventure Wiring Harness page, and found this:
600.11.074.100 START-STOP SWITCH 03
Note the .100 and the description difference.
Stu, are your part numbers for the switch internals to go into the switch block assembly?