Found this one from Stanford (https://sehub.stanford.edu/sites/default/files/BoardMemberContract.pdf) and one from SEC (https://www.sec.gov/Archives/edgar/data/1396054/000107878214000572/f10k123113_ex10z16.htm) but not sure if these are the best out there.

For instance, they don't touch upon dilution and vesting.

It feels like something that YC should open source.