The Ron Francis kit probably requires dual poles to keep the right and left signals seperate. If you use a single pole switch you'll need to isolate the RH & LH circuits some other way (usually with a diode) or the turn signals will feedback through the hazard switch and make both sides flash instead of only one side.
Radio shack can help. You would like to have a standard diode rated at 5 amps min. You will connect from the switched side of the switch to two diodes one to the right turn wire and one to the left turn wire. If you don't use the diodes with the SPST switch both turn signals will flash when you go to use the directional turn signal.
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