BobBrown - sorry I'm late on an answer.   Your Kubota dealer handles Land Pride grapples.  Mine is the GSC1560.   820 pounds of AR400 steel.  For that price - $4350 - they installed the WR Long 3rd function valve also.  $3150 for the grapple - $1200 for the WR Long valve.   Mine is one of the heavies grapples that Land Pride sells.    It has been a real beast.  Your Kubota dealer can get you any grapple that Land Pride makes.
It's not cheap but the nice thing - not a moments problem with any of it.   Check post #18 for pictures.  AND - do not forget to do something regarding a mod to your brush guard.  Limbs, sticks & stobs have a nasty way of finding your radiator, grill or battery.
FISHBONES - when you get a chance - post a pic of your grapple.
There is a custom mfg company just 70 miles north of me.  ANBO   They make custom grapples - among other implements.   I would have went with one of their custom made units - but I wanted it installed by somebody who knew what they were doing.   No way to get my tractor up to ANBO.   Couldn't ask Kubota to install a grapple made by others.   Besides - this GSC1560 is more grapple than I will ever need.
The Kubota dealer knew what I do out here and the install was great.   All the controls and hoses are well protected and have never given a problem