Thanks to all who added their info. It certainly helped me sort out whether to look for another pin on or move to QA buckets
I wanted to summarize what I learned to date since no forum has clear information about BH buckets for
M59
Neil Messick of Messicks.com was very helpful. Another person, a mechanic with 25 years working on Kubotas, was also very helpful.
In summary the BH Quick Attach ( QA ) is the preferred bucket attach method because any used bucket can be modified by applying weld on ears. Pin ons, not directly useable, are very hard to modify. The used pin on pool fitting
M59 is very small so new from Kubota is pretty much the only way to get buckets.
The
M59 QC/ Quick Coupler is part number BT4580 but the preferred QC, from Kubota mid size/ compact excavators, is the K7870 since there is much larger supply of used excavator buckets than there are used
M59 QA buckets. The K7870 is used on the KX121 compact excavator.
Not until about 2010 did the different equipment manufacturers begin move to standardized QA buckets so the pool of used buckets fitting the
M59 QC is pretty small.
Hope this helps others interested in
M59