I've still got vacuum wipers in my COE (47). I haven't tried converting it but there should be plenty of room.
Even though COEs had 2 wipers, each wiper had a separate wiper motor and operated independently. There is no mechanism that connects the 2 wiper arms to one motor and switch. Hence the extra holes on the overhead panel on both sides. (There are two holes on each side. One hole is for the push-pull on-off switch and the other hole is for a knob that you turn to adjust wiper speed.)
This makes a real easy conversion to electric. Just install 2 independent electric wiper assemblies and wire to one switch. Hope it helps - have fun.
COE Dan