Trying to replace my Dump Valve with a like for like. I have tried calling certain companies and they are all asking for a part number..... thats their job aint it !?

I have the engine number, but does anyone know where I can go to quote engine number and get given the part number for the dump valve.

How much would a standard re-circ dump valve cost for the engine EJ207DW4** ?

Any ideas on who could provide me with the standard re-circ one.

Ta muchly