i have a 1987 bayliner sport 17ft with the 2.3 omc engine. the points burnt up on it a few weeks ago and i havnt been able to get the right ones for it. the tune up kit that it calls for is 18-5251 but its not the right points set. the little tab that contacts the cam on the distributor shaft is smaller than the original points set. it has the ys mallory distributor. so far i have bought two tune up kits off ebay and niether has been right. any help would be appreciated.