If they have the curly wire they are for the Explorer series. (Safari, Etrac, SE Pro, etc.) The other ones for other Minelabs don't have the curly wire. Yes, the new ones have more spokes, but I have never heard whether they are any better functioning than the older model. Often one need to hook a piece of wire onto the coil jack to pull that curly wire up through the shaft. Most coils basically last forever if not abused, and most sellers will say how much use is in the older ones. Most are for sale by MD users and often not used a whole lot, and often the user just got a different machine and wants to sell the other gear they have for their old machine.