Good Luck since it is a trademark I haven't been able to find one for YEARS!

Iknow I saw a site that sold them. they were very expensive too. see if I can find it again I might have booked marked it. But I figured I'ld let you know there is one site out there.

here is a site price was good but they only had 1
http://www.grandembroiderydesigns.com/85-harley-davidson-sport-machine-embroidery-design.php

this is antoher site with 1 only but price is good
http://www.pfaffmachines.co.uk/embroiderydesigns/86-harley-davidson-legend-embroidery-design.html

here is a site with all the emblems

http://embroiderydesignsbygina.com/sports.aspx

here is a site with different bikes

http://www.sewingmachine-sales.co.uk/embroiderydesigns/all-designs-page9.html