No, they look like 120V neon lamp. See the voltage requirements? 120V
LEDs only require 5mA - 20mA at 1.7 to 2.x voltage drop across the LED.
what is the distance between the bottom of the IO module and the bottom of the buttons on the IO module? the design I want to make work has the IO really close to the bottom of the case. I guess I should add an extra mm for solder points too.
It's about 0.28" distance from the bottom of the PCB to the "center line" of the switch holes.
will an XLR input fit above the IO buttons in a 1U case?
No. an XLR hole is about 15/16" diameter. A 1u rack is only 1.75" high (but that is the panel height... the case height will be less than that... maybe 1.5", and you have to account for the thickness of the metal for your usable height.
Is there a +48v toggle just like the included one only vertical? anyone have a part number for it on hand? The position of it works just fine, but I want it to switch up and down because the pre is going to be mounted horizontally.
The vertical toggle lead footprint will not match the holes on what is on the PCB.
What you can do, is use normal DPDT switch, and just run wires from the switch to the PCB if you want to relocate your switch.
and one more thing... do they make pannel mount LED holders so I can move the +48v LED above the toggle? I guess I can dig around, but I'm not very good at finding components yet.
Yes, there are thousands of choices, of various colors and sizes of LEDs. You can just use wires to route from the LED to the PCB. That way, you can place your LED anywhere you like.