This is the Factory RC Yokomo YZ2 Carbon Fiber Shorty Brace with adjustable battery stop blocks. Lengthened to prevent the brace from popping out of the waterfall like the stock part an comes with adjustable battery stop instead of foam blocks which allows you to run the battery shifted forward or rearward. Simply install the battery stop on either side, and adjust to your packs length to remove any slack. Remove a battery stop to allow full rearward or full forward positioning in the car. Fitment is snug and prevents the battery from shifting. This brace is designed to be narrow allowing for additional chassis flex in the car. Battery brace is made from 3mm Carbon Fiber and your choice of Heavy Duty Carbon Steel screws or Titanium Screws.  Upgrade to Factory RC!