As promised in another thread, I have a car seat mount that I'd like to share.

I always record when driving and needed a car seat bracket that I could move with some ease.
There are few parts to this bracket and it's quite simple to make. I hope you find this helpful and if you have any questions, please ask.
The parts I used are
Amazon.com: Alpen Car Window Mounting Device #703: Sports & Outdoors
Everbilt 1/2 in. x 96 in. Aluminum Angle Bar with 1/20 in. Thick-802677 at The Home Depot
Everbilt #8-32 tpi x 1-1/4 in. Stainless-Steel Round-Head Combo Drive Machine Screw (4-Piece per Pack)-814241 at The Home Depot
Creatology? Adhesive Foam Sheet

Sorry for the links, I keep getting a popup stating I don't have permission to insert photos.

I cut the angled aluminum- 1 cut was 15" and the second was 8"
I test fit the Alpine camera mount and found the aluminum was a little to large so I shaved off enough of the top section to slide into the mount. The piece that you tighten the camera mount to was a little too big so I disassembled the inside mount piece and shaved the top portion.
You'll see the aluminum in the mount here.
Attachment 2365
I measured my headrest brackets and drilled holes 1/2" to the outside of the headrest posts and one towards the center of the post.
Attachment 2366
Once test fitted and it was nice and snug, I washed the aluminum and sprayed a layer of metal etching primer and let that settle.
After the primer was dry and ready, I sprayed the aluminum with a gun metal grey spray paint
Attachment 2367
Once the paint dried, I cut the foam 8" long and wide enough to fit the aluminum. I cut holes in the foam where the screw holes are.
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Attached Images