You probably are referring to your Simplicity lawn mower with a B&S motor, mentioned in your other threads. Is the throttle control on the mower itself? If it is you would need to find a parts diagram for that.
#4
StarTech
Incomplete model number but assuming 170707-1128-99. Engine mounted throttle control is item 222/222A depending style you need. 222 is the one that a remote throttle can be attached to.