Stock rotor size is M6 x 17mm, these are M6 x 20mm & I have checked, there is plenty of space for the bolts to go into the wheel. You will need to buy 3 qty as you will need 12 bolts for the stock wheel. 600F3 wheel, no clue.
Stock size is M8 X 32mm & these are M8 X 35 mm & I have checked they will fit as there is plenty of space for the bolt to go through. NOTE that these are torx bolts, so a torx bit will be required. I have torx bits so it wasn't a concern for me.
All of the above for a grand total of $26.36 including shipping. Not bad at all.
FYI, these are grade 5 bolts, same as those sold by Pro Bolt.
More than likely yes... hell even the change between steel and Ti bolts in total is pretty much minimal.
I will take the stock bolt & this one to someone who has a decent enough scale & check it out.
From what I understand, ti should be close to 50% less weight. Since these guys are a bit longer, I estimate them to be 40% lighter. Not that even a 100% lighter weight will make a difference on the 919 but I needed new rotor bolts & the amount I spent on these is a LOT less than what some folks spend on fender eliminators