Alright I found it in the stack of paper's in a 4 door truck that can only haul me and my filing cabinet??? The manufacturer for the bulkhead fitting's is Welcome to Flow Control
and you need to know model numbers from there web site and then they will refer you to the closest supplier. Sorry I put the ticket in my hand's and remembered the BS but they have any size type and even swivel type but they are not as cheap as amazon but I can't find the size your looking for except for this place? Hope I helped?