Look under ignition coil on the parts fiche.
02 COLLAR, PIVOT
17937-881-000 004 $6.02 $4.21
No. 2
Or, it's likely hiding down low between the alternator and rear engine case. That pocket is a catch-all. A small flexible magnet may retrieve it for you.
I'll have to try and locate a small flexible magnet, I have tried feeling in that area with fingers but I'm sure you already know that doesn't get in there very far

EDIT: Forgot to tell you thanks for pointing out where I can find the part on the fiche!!
