It may be that someone like grainger or McMaster has the triple connectors. I don't think you'll find one in a big box store.
Considering the application, I'd get the highest quality that I could find.
But you could go with something like this combination
__________________
Steve
'08 Boxster RS60 Spyder #0099/1960
- never named a car before, but this is Charlotte.
'88 targa
SOLD 2004 - gone but not forgotten