have you confirmed it is indeed a bad solenoid coil? the PCU connector on mine is jammed up against the structure, and if yours is also, you could be experiencing a wiring issues for the control solenoid circuit at the PCU or somewhere else in the dash, and not necessarily a bad coil.
beyond that it should be a fairly generic 24VDC relay/solenoid/actuator coil. i would look for a part on the coils themselves and order from that...
From what I have seen there are at least 2 different 3 valve PCU styles(I have overhauled two types so far), and their difference is that they use slightly different type/style solenoid valves. The solenoid valves are modular(coil, tube core and needle valve) and can be disassembled. The coils look similar but I am not sure if they are interchangeable(i suspect they probably are). Their needle valve controls pilot airflow to move the larger sliding valve spools in the main valve body. A problem with the control spool not sliding properly in its bore might also present as a bad solenoid.
This would not be my first case of chasing bad dash wiring between CTIS controller and PCU, and certainly not my first experience with a fouled PCU spool valve
