when i had standard brakes on the car i fitted to the inner drive shaft cup and a bracket off the beam but now i have ap 330mm its so much better read out and a easier fit the magnet is on one of the bell bolts and the bracket is fitted to the shock . its very easy to fit , the slightly harder bit wat to set it up to read the correct speed i measured the wheel and tyre but it was still out so i used a gps item to set it up and it is spot on