Non-A/C Cab to A/C cab question

[B. W.]

I'm converting a non-A/C cab to factory air. Did a search but couldn't find any info. There are three holes I need to drill in the firewall. One for the blend door cable, one for the vacuum lines and one for the top heater hose.

Does anyone know the size of these holes?

Are those grommets reproduced?

If someone could measure these I sure would appreciate it. Thanks!
(borrowed pic from a forum member. Sorry, don't know who or I'd give you credit!)