Not enough brass standoff placements in my case for my motherboard

They sell 'em at MicroCenter, so I'd think that any local Computer Store would have them.

Most mobos need 9, how many came w/case?

My mobo needs 7, the case came with plenty, 12 I think. The question I'm asking is if a mobo needs to have all of the brass standoffs in place for it to be fine. I ask this because my case only has slots for 6 of my mobo's placements. Hopefully that's clear, I'll try to re-clarify if need be.

It is OK.

Put in a standoff everywhere there is a match between the hole in the motherboard, and a standoff place in the case. The main thing is that the motherboard is supported well enough not to flex much.