Questions on front air ride

[Chrisxeasy]

I have a 75 c10 has 2.5 drop spindles already up front and wanna do bags as we'll for the ride and lowering desired. I don't need to be able to adjust, just the air up valves would work. What kinda bags do I look for (what size? Psi?)? And do I get brackets to attach to the factory spring cups? Very inexperienced when it comes to these bags. I want a low look and even set on the ground sometimes at a show if necessary.

Can someone out there help me out! Haha