AC Hose Connectors

[70GMCer]

I'm to the point where I'm going to need to buy the AC hoses for my updated ac system in my 83.

I need to know what size fitting is needed where it connects to the dryer pipe as shown in the picture. (Has the red cap on the pipe)

I've done a google search and the sizes stated for the connectors say #6, #8, #10 & so on.

The only difference from the factory setup is I'll be using a Sanden 508 compressor using R134

The evap & condenser is of an OEM replacement.