Genuine 1970's Period NOS " Formula - Speedwell No 47 " Vauxhall Firenza - Magnum 15mm - 36 Spline Column Fitting Steering Wheel Boss Kit. Genuine Complete boss kit in New Old Stock condition, fits a number of classic Formula - Speedwell Large Centre Woodrim + Leather Steering Wheels. Alloy boss has the number 47 cast on the bottom. Original packaging box included. Free 48Hr UK Postage Included.