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 94mm (3 11/16") front and 17mm (11/16") rear range of height adjustment. Height at center of bottom mounting hole is 70.5mm (2 3/4") front and 109mm (4 5/16") rear. The high-strength-steel construction allows thinner (3mm) material than standard (6mm) brackets without sacrificing strength. FIA approved.