Anyone know anything about disc brakes?

RS805 front brake takes M5 bolts to mount on fork. The bolts it came with arent long enough for the engagement, where can I get a replacement?

That sounds wrong. (and shimano doesnt usually fuck up, so china carbon/user error? :))
The specs say there should be room for 8-10mm thread engagement with the fork:

and 7.5mm engaged thread gives a secure connection (1.5 times the bolt diameter, a rule of thumb from somewhere...)

But the bolts are standard m5x0.8, so you can get some longer ones (with torx...)

How deep is the m5 threading on the fork?

and also pictures!....