your 99 ex should have one plug. but 9 wires correct? well the obd1 distrubutors run two plugs......one has seven wires...the other has the 2 wires. (blue and yelow black) now what i think you are trying to do is to put a obd1 distrubutor onto an obd 2 engine? this is fine...but you have to rewire the wires. since both styles have a total of nine wires.......you should be able to wire it in...either hardwire with no clip....or pick up a obd2 izzy clip...or obd 1 engine harness clip. all the nine wire colors match perfectly from an obd1 to obd2 dizzy. make sense?