Just checked my own stats and here's the two guys records with Harps:
Con McLaughlin scored a total of 110 league goals with Harps in 314 games. 36 of these goals (156 games) came in the old one-tier LOI set-up, with 74 goals (158 games) coming after the formation of the First Division.
Kevin McHugh has scored a total of 124 league goals with Harps in 253 games (to date). 24 of the goals (87 games) have come in the Premier Division. He has scored exactly 100 First Division goals (166 games) to date, while he also has another five goals (8 games) in promotion/relegation games which I'm not sure if they count as league goals - they were all scored in games where Harps were the First Divison club.
These players, along with Brendan Bradley, are the only three players to have scored more than 100 LOI goals for the club.