FCR Chassis fixture jig and set-up blocks Precision 3-1400 and 3-1401FCR precision chassis fixture. Designed to hold the chassis and guide flag perpindicular to the front and rear axle. Posts for setting the front and rear axles in any bushing positions, This will provide improved handling. Works for both 4" and 4 1 2" FCR chassis. Measures 3 1 2" x 7 1 4" x 1 2" Corian. Includes all stainless steel hardware. FCR set up blocks. New design set up blocks sets the clearance to . 062. Select the tire size. With the blocks