http://www.finishlineperformance.com/pdf/mazda6/bulletin/06-001-07-1738.pdf
Grease is P# 0000-77-230E-01
Someone set up a group buy
Here's a hint. And if you meant you tried that online, I think it's a dealer only part.
Any way to do this at home? I don't have the time to drop it off at a dealer for 2 days for a grease job.