I've seen those, but they never interested me so have given them much thought. Assuming the switches are up and down for the foot rest or tilt or whatever, it seems likely that the ones you have seen on Amazon server the same purpose, except that where yours has two commons going to two separate switches the one you saw there shares the common. The first thing I would wonder is whether the switch you have is actually bad or if maybe you have a wire pulled loose someplace, so would check the switch with an ohmmeter. If it turns out good, my next thought would be that there was quite possibly a plastic retainer on the back off it, so would look at the back of the switch to see if there is a groove where one would have been. If so, I would start googling switch retainer, things like that, and see if one is to be had someplace. It used to be that Radio Shack and hundreds of independent electronics stores across the country would at least know what you were looking for and very possibly be able to order the right one, but of course those days are long gone. Next, if you do end up needing to order a replacement switch, what voltage and amp rating do you need? The original switch might be marked, or maybe not, so you may need to look around the chair for a transformer, or carefully, very carefully, don't grab the bare wires, check the voltage to the switch. Best way to do this would probably be with the wires connected to the switch so that you have something more stable to hold the meter to. While doing this you could also determine for sure that the two switches share a common lead.