I passed on the older hitch from a 455.
Today I bought a used front hitch & blade that was used on a X485.
I got the hydraulic outlets installed & mounted the hitch, I like being able to use the blade without removing the mower deck. I am glad I went the newer hitch.
I did not get the valve that comes with a new hitch, but I found that it is not needed. As others have said, including the person I bought the hitch from, if you lock the mower up to the highest setting the the valve is not needed.