Where are people bringing their harness through the firewall?

[cdog73]

Trying to figure out where to bring my harness through the firewall on my 5.3 swap. I am mounting the computer under the dash and want to hide as much of the wiring as possible. Not sure where to bring it through the firewall or what type of a grommet to run where the harness will come thru. Picture would be great cause I cant find the info in the forums that I'm looking for. if anyone knows of some posts where I can find this info, that would be awesome too. Thanks guys