I think #6 is the bigger spring that goes between the butterfly cams? Or do yo mean it comes with that spring? Sorry I don't have a picture the on board picture hosting keeps giving me an error when I try to upload. This is the little spring that holds tension on the synch screws.
You can see one in the the opening picture in this video link
https://www.youtube.com/watch?v=7rtNABYbpmkIts just to the left of the intake port and between the carbs.
I wound up ordering
https://www.amazon.com/dp/B0C33CBKFY?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1they seems to be the right size and wire diameter.