The gray mount is available from Starlink.
The red suction cup handles are from Harbor Freight (available at many places, Amazon, etc.)
The handles are filled with JB Weld for strength.
Drill or drill and tap the handles for whatever nuts/bolts you choose.
I do have some shot bags to weigh down the mount for added support.
Or, you could use speaker stands and not need to get up on the bus roof:
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