I need to purchase only the magnet bar. After an accident I now need to buy a new helmet, but I need a new magnet bar. Do you sell it separately, and how much is it?

Installed on back of your helmet for safety. This bright LED light displays your running light and brake light in various colors and color pattern of your choosing. There is no wiring required. When turned on, will detect your sudden deceleration (via built-in G sensor) and activated the brake light pattern. Visible up to 1/4 mile, make you visible at night. Just place the magnet bar on the back of your helmet with provided double sided adhesive. The light feature will grab onto it securely. The Built-in rechargeable battery with over 12 hours with charge via mini USB in about 2 hours.

Is it appropriate for escooter use? Also, my helmet is not a motorcycle helmet but does not have any vents or holes on the lower back area.

You can choose the RED color lights. You will have option to have RED in different paterns, such as flashing, sliding...

please search for SRHL5 on www.SYKIK.com or see link bellow for a pack of 2 :https://sykik.com/products/metal-footingfor-srhl5?_pos=1&_sid=791aa45e8&_ss=r

I want to install it by my license plate on my Motorcycle with ABS (need to keep magnets away from ABS breaks). Can I install this without the magnet bar and will it work?

The unit will work without a magnet bar. But the magnet is installed inside the light unit. If you wish, we can have it removed. You will need to let us know when ordering.If you have a bigger bike, you might want to take a look at " SRML3"  https://sykik.com/products/brake-light-for-baggers-and-touring-bikes?_pos=1&_sid=08c36476e&_ss=r