I -HAVE- seen at least 4 situations where adapter and generic lines have been made.
everything from crudely torched out adapter plated with soft lines tapped in and hung along the tractor, to nice machined aluminum plates from a machinist.
have also seen the lower attachment from the tractor re-used and brazed to, then a adapter made for the pump ( have seen a non oem pump too! ).
so 'rolling your own' is not out of the question.. though it would require some work.
one of the situations I say required lots of butchering, as a piston pump was used, the oem lower line connection tot he tractor from the vane pump was re-used, and brazed onto the lines with adapters for soft lines, then the flange of a piston pump for a 00 series was cut up and scavanged to make the pump connection.
IMHO.. too many good parts were cut up to make that conversion.. though I'm sure the tractor owner felt it was a good trade to have hyds..
keep looking, and catch the next one if ya need it.
soundguy