Anti-Roll assembly is designed for Pro-Stock type door cars. The unit features splined ends with 1-1/4" serration for secure attachment. The bar is 1-1/4" x .188" wall 4130 tube. 5" arms (p/n 12011). 18" center. Comes with bushings that fit the I.D. of a 1-5/8" x .083" tube. If custom width is needed, please call for availability. Linkage kit (part number 35110) sold separately.