The 1400 BOM identifies this as a "DPDT slide switch". So, find a close match by googling "DPDT horizontal slide siwtch". They're as plentiful as cockroaches.
Depends on your druthers--you can get slide switches configured either way. The important thing is the pin spacing. It might be an advantage to have the switch toggle somewhat recessed so the chance of breakage is minimal. You could even install a small toggle switch if the mood struck you.
The keywords here are "right angle", thus you get this one: