Thanks so much. That helps a lot.
Glad to help! There is considerable discussion on the L1200 loader here on the forum if you do a search.
North Idaho Wolfman really knows these older Kubota tractors and mentions no factory loader for your L255. I would surmise, (yep I get in trouble doing that) that the L1200 loader was made by a second party and had some business relationship with Kubota or Kubota dealers to supply this loader for installation on the L255 and related models.
Nothing is impossible but finding a decent shape L1200 loader PLUS the control valve and all related plumbing and hardware is going to be a uphill battle for you .
Good luck and happy tractoring!