This side mount seat bracket kit is made by OMP, but will fit most side mount racing seats (bolt spacing 289mm / 11 3/8"). Compact, one-piece steel brackets are designed for strength with a 93mm (3 5/8") front and 34.5mm (1 3/8") rear range of height adjustment. Height at center of bottom mounting hole is 70.5mm (2 3/4") front and 110mm (4 3/8") rear. The high-strength-steel construction allows thinner (3mm) material than standard (6mm) brackets without sacrificing strength. FIA approved.