N-Fab make 4 different bars that fit the bill. They make them for straight or curved bars with or without the top protection bar.
I've included some pictures below:
Multi-Mount Open Top, Straight - $149
Multi-Mount Open Top, Radius - $199
The first three bars feature Multi-Mount so that you can mix and match various lights bars, cubes, or any type of surface mount light. The 4th bar can only mount a 30" straight LED bar.
The straight bar mounts can mount up to a 30" light on its own. We have a way to make it fit a 40" straight light bar on its own.
The radius bars can mount up to a 40" curved bar.
All mounts are available in either gloss black or textured black. Please let me know if you have any additional questions and we can get you set up!
Can you fit the old school round KC lights on either of the top 2 bars? (and/or the newer LED version.)