I think I'll be tearing the engine bay down once I coral the bits I'm missing. I found the cook book steps in the FSM and yes it reads straight forward until you open something up and springs fly everywhere. I've hunted around the web and the valve assembly does look the same on both platforms so I'll likely take a punt. Thanks for the Rockauto suggestion too.
***Update***
Just jumped under the motor to read the PS box p/n 2267262 which matches the p/n on the for sale ad so I'm happy with this that there's compatibility.