Best I could find was complete valve assy. os does not list just the needle.
In fact the Tower pg below states the needle is not available as a separate item. If you use different needle, you will probably compromise tuning, your choice.

http://www2.towerhobbies.com/cgi-bin...00&FVPROFIL=++
$18

if you need bracket, here it is:
http://www2.towerhobbies.com/cgi-bin...?&I=LXGCV2&P=V

Good luck.