Ford 7710, Ford 550, Ford 1910, Ford 4430, KD Forklift, Ford LGT17H, New Holland L255 Skidsteer
The relief is actually still available, about $620. from Deere. It is a Husco valve and I believe Ford used similar. I believe Deere used it on 310, 410E, which a salvage yard would have.
You got it fixed nevertheless and this is a moot point now, but just wanted to add 2 cents to it.