All of the button pedals you have will work for your FW. There are basically 2 leads (cords) for the singer machines: A double lead cord - will have a cord that goes to the pedal and one to the wall, and a single lead cord - will go to the pedal and another cord altogether will go to the wall.
The pedals are interchangeable with both lead sets. You have a veritable goldmine there.
I should also mention that I haven't seen a button pedal wear out. I've seen them need adjustment and sometimes a little cleaning and then they're good as new.... I posted instructions here:
http://www.archaicarcane.com/singerattheraces/
http://www.archaicarcane.com/what-a-pile-of/
The electronic pedals are very easy to wire as well, as long as it's a 2 lead pedal not one meant for a 3 wire cord, it wires pretty much exactly the same as a button pedal, but may require the addition of a set of crimp on connectors to connect to the circuit board.