You can use all your regular stuff with these saddles. The panels will be more visible with a normal saddle pad, and you won’t have the open area down the spine, but it will work. Regular girth is fine, and you can use regular stirrup leathers, it just puts a little more under your leg, especially flapless. I couldn’t use the webbers when I tried an EQ saddle, they would not go short enough. You also cannot run up webbers, which I can’t stand.
An EQ just didn’t work for me, but I’m glad they are doing more demos with the adjustible stirrup bars -that was a specific request of mine when ordering a demo saddle.