So on the swivel mounts.....This is maybe a little bit of a longshot, but bear with me. I have always wanted to figure out some way to utilize this sturdy mounting point to mount things like GPS' via RAM mounts. I like to have my stuff up high and out of the way of my windshield vision. I'm tired of suction cups letting go and dropping my stuff on the floorboard. I had thought of figuring out a way to attach a RAM mount ball using this attachment point on the roof. Maybe some kind of bracket you can sandwich in between the visor mount and the roof. If you are making these swivels however, any chance you could integrate something into the design to allow for a RAM mount ball to be installed and used for mounting various light weight devices up high? Made a crude drawing of what I mean here. Shot of the RAM mount swivel looking straight on at it:
View attachment 2731802
I'm not an artist but hopefully you get the idea. So you have the normal visor swivel and mount piece with sort of extra ear molded into it which would allow you to have a place to mount a RAM ball mount. You would have to mess with it so that it clears the windshield and doesn't impede the movement of the swivel itself, but since you are making them maybe there could be a version you could offer for folks that want to mount things in their trucks. The ear would prolly have to be angled and offset in a way to clear the various contours of the roof and cab. But seems like it could be done. This mounting point is much more sturdy than the suction cups on windshields. Maybe a non-starter because of design/printing challenges, but an idea for you to do what you want with. HTH