Thanks for the info! Looked in my toolbox and found the leftover one. Here's the full info in case anyone needs one in a pinch (literally what it says on the package):
Handi-Pack
Part# 87276
8MM x 25MM
COARSE THREAD
JIS FLANGE BOLT The bolt head is marked with W.T 10.9 , so it seems I lucked out ...

I snapped one off when replacing the front rotors on my '05 GXP a few years back. It was 8 at night and the car was in my friends garage...so we needed something to finish and get the car out. Went to Menards and found the same bolts for $2. Not sure if they are exactly the same in terms of strength ...

Poking around on northstarperformance.com, I noticed that they recently created a page for tuning the Bonneville GXP ECM's:

http://www.northstarperformance.com/gxptune2019.php

Sounds like its a $100 deposit, with $449 + $75 core charge for a stage 3 tune. They list their tuning stages here ...

This info was helpful almost 10 years later. I am considering buying base model headlights for the following reasons:
1. The lenses constantly haze over, even after sanding them down and polishing them. The lens plastic seems to be failing as it is also filled with micro-cracks.
2. HIR lights (9011 ...