Those piezos will work fine.Keep in mind that they are a 3 wire type , the small ceramic area is for a 3rd(feedback)lead,so solder to the larger ceramic area
I added pics from a repair I did last night...he was having problems with the rim on a 8" tom,the kit he bought new a month or so ago...looks like when soldered originally the piezo got pretty hot (discolored)and there is not much ceramic left..it's also a 35mm piezo.I have found a lot of inconsistency when it comes to the piezos..some drums have a 27mm for the rim , some have 35mm.I have found a number of 12" to have 35mm piezo on both head and rim...some completely covered with a brittle,almost epoxy coating , alot of them you can't repair, you have to replace.
I try to do repairs at night to remove temptation/impatientience to reassemble too quickly as I use a rubber coating, and the coating needs to cure for 4 hours...I always shrink wrap and the rubber coating can easily be peeled off/removed if for some reason a wire breaks again..shrink wrapping/coating bonds all together into a unit instead of 2 wires and piezo vibrating/fighting independently.I haven't had anyone bring one back yet (knock on wood)..but I haven't done a repair for a real heavy hitter either.The coating is available at Home Depot..."Plasti-Dip".It's available in spray or a can to dip.To assist in holding everything together so you can focus on the actual soldering, in the search at Home Depot..keywords "Helping Hand"