ok i have a 1998 tw and a 2001 without a title,, i want to install the right hand handlebar switch and throttle tube asy from the 2001 to the 98 bike,,, im doing this so i can put the front disk brake on the 98 bike,, i see the wiring connectors are different the 98 has three wires and the 2001 has four. what to do??? also what is needed for this throttle asy...thanks