Although of course you could use 36-1, 60-2, 36-2(rover), 36-4(rover), 36-4(rover different one)12-1 yamaha, 24-1 suzuki, 60-1 jaguar, 36-2 toyota, 48-2 ducati, 8+P suzuki, 12+P honda.
So you have a large choice that will work with this ecu!!
On a std cossie item I just machined the rear to the inside diametre of the trigger-wheel.com wheel (5 1/4") and took out the correct amount from the std pulley to enable perfect alignment, did not even need to adjust gap, a bit tricky to do as only one chance to get it right(or bollocks it up!!).
tabetha