The Detroit Speed Inc., steering wheel adapter is made for 6 bolt pattern steering wheels. They fit 1969-91 GM steering column shafts as well as Ididit or Flaming River columns with GM style shafts. The correct M5 flat head screws to match the metric taper on the steering wheels are also included. The hub is 2.5” tall and is light weight at about 1 lbs. They are offered in either natural aluminum or black anodize finish.