a bit more info would help... Kind of coach/chassis?
I have run into this on other heavy vehicles, basically, we just had to fab a bracket, or re-drill the existing bracket to mount the new valve. You will just need your ride height spec to set up the new one once you have it installed.
I have also 'Rigged' a corner bag by removing the line from the valve, fitting a quick-connect fitting on the hose, filling the bag to a reasonable height, and pinching the line off with a pair of visegrips.
Take it easy driving, as your suspension on the bag is now non adjustable.
It's not a fix, but it will get you off the side of the road if that is where you are...
"It's always wrong, everywhere, for anyone, to believe anything beyond insufficient evidence" -- William Kingdon Clifford
John (N9MXX) & Derek (KC9KEM)