Please Help 1988 bayline CC 1903 Missing Plugs?

[xterra2007]

Hi guys just got a 1988 bayliner cc 1903. I am pretty sure it is missing a plug on hull where the live well drains out. can i replace them and where could I get one? see pictures below.
http://s902.photobucket.com/albums/ac229/flyersfan2009_2009/