Front upper mount for GRK4. One carbon fiber part (pictured in photo 1) will be shipped. Installing this and the body mount will dramatically change the handling. It seems to affect the overall weight transfer. Photo 2 compares it with the GRK5 version. There are holes 1mm inward on each side. This allows for a longer upper arm, which can improve front tire ground contact. Officially approved part for the GRK strongest competition. Made by Metal-Garage. L-brackets and short body stays are also available on a separate page. GRK 4 front upper mount Metal Garage GRK4 upper