My grommet part numbers are here on this post
http://67-72chevytrucks.com/vboard/s...46#post7635146
I got them at my local Chevy dealer parts department.
Breather/flame arrester grommet part number 14091870
PCV valve grommet part number 3989350
I wore out the one for the flame arrester after a couple years of mistreating it taking off the air cleaner over and over, and got another one of those on eBay, it is a Dorman 42052.