this is the info I received from them regarding making a custom air box.
"Yep, you'd need to remove your current airbox to take measurements.
We need, as precise as you can get them:
the distance from center to center of carbs #1 and #2
the distance from center to center of #2 and #3
the length of the flange
the outside diameter of the flange, including any little rings that might be around it
the inside diameter of the flange"
1980 KZ550A
1980 CB750F
