As this question seems to have stalled the thread, or you have all simply lost interest, I think this installment needs to be closed.
The answer I have, and there is no need for pedantic correction if I have missed something, is 8 own goals conceded in the Premier League at St Mary's. The latest being JWP vs Man City on Dec 30th 2018, and the preceding 6 being
Jakobson vs Skates Nov 13th 2004
Higginbotham vs Middlesborough Dec 11th 2004
Higginbotham vs Norwich Apr 30th 2004
Hooiveld vs Fulham Oct 7th 2012
Guly vs Arsenal Jan 1st 2013
Hooiveld vs Spurs Dec 22nd 2013
But who scored the first, and against which opponents ?