dilemma. I personally prefer sealed connectors. A call to caspers, ask for sealed spal kit mates, then install them on the wires from spal. You'd have to crimp the wires onto the terminals and assemble them. Or, you might consider a pair of pigtails where you can solder them in place on the wiring.
Alternatively, caspers can supply an adapter for each connector, male t style on one end, male sealed on the other, maybe 3 in. Long. If it were my car, i'd do away with the unsealed connections and go for the mating connector...but that's just me.
Why spal ships the dual 11 in. Fans with unsealed connectors is beyond me.