Okay, so let me ask you this:
When I was browsing at 'jetrus.com', I noticed that main jets come in different series based on their length, head diameter, and thread diameter.
i.e.
OVERALL LENGTH = 8.5 mm
SHAFT DIAMETER = 5.5 mm
DIAMETER OF THREAD = 6.9 mm
What size does the guilty 50 use?
I figure since they have flat rate shipping, I might as well order a variety of jet sizes.