I just bought a Dakine tailgate pad and it is perfect for the rear bar. I actually bought both black and camo by accident
Dakine Tailgate Surfboard Pad
https://a.co/d/f57gJQx
Dakine Tailgate Surfboard Pad
https://a.co/d/7sZ0eSY
Also bought round pads and aero pads for front windshield header.
Dakine - Unisex Aero Rack Pads 34" Rack
https://a.co/d/aWSgTLJ
Dakine Car Rack Pads 34 inch
https://a.co/d/0Ng7w6C
Not sure if the aero pads will work with just pressure of the board, or the round with strap through it.
Maybe I'll try the extra tailgate pad on the windshield. the "flaps" aren't that long - 4-5", so might protect windshield soft top seal.