Called a local dealer. He says you need two of K2581-38160. The Google turns up several sources. You might try Messick's. They have a sticky at the top of the forum. Their search says they have stock.
Please do verify that this is the right part number. I'm working by remote control here
How about a visit to the original dealer. Maybe with a baseball bat...
Z.
It pays to keep a notebook of your work.
Went back and looked at what I did when I first got the BX24. There it was in black and white "...two parts unknown use...call <dealer>..." Then two days later "dealer says they're not required...". But, like many of us, I the "unused part" into a storage bin along with my manuals and some other Kubota related stuff. And, there they were 8 years later.
Like someone said, not sure how I managed all these years without the right setup.
Anyway, thanks for all the help. The pictures are what did it for me.
Cheers!
Jeff