I'm looking to purchase a PTT motor for my 1999 Yamaha S150 TXRX. When I look up the part # on Arco site my motor calls for a # 6240. When I look up the PTT motor on iboats their part # is 6241 and it is for an OMC motor. Also the difference between the 6240 & 6241 is the 6240 has "O" ring connectors and the 6241 has spade connectors. Something is messed up!