yeah, good site.  very interesting

I like these either enter the parts number on page
http://capital.hdspares.com.au/

or use this page to search by year
http://partsfinder.onlinemicrofiche.com/capitalhdspares/showmodel.asp?make=hdmc

gives fairly up to date Aussie prices but not yet 2018 parts.

I like the diagrams when your looking in the OEM lookup section.