Your answer is over there.
The PF/2 Energizer system has been discontinued. Sloan Flushmate offers a changeout kit for more fixtures. The kit contains everything needed to change out the system to Flushmate. Below is the list of OEM tank model numbers and Flushmate part numbers for the changeout kit.
Crane Tank # 3612, FM KIT M-101526-F3CK
Eljer Tank # 141-7000, FM KIT M-101526-F3EK
Peerless Tank # 1, FM KIT M-101526-F3PK