I confirmed with a local Kubota dealer that the correct front mount blade fro my mount is what had. It's a B2775.
I asked for a price quote and he quoted me $2,200 Plus Tax for the blade with the Hydraulic adjustment and female receiver.
I found a used one for $1,600 in real good condition, but it's a 10 hours drive one-way from me. An informal transportation/shipping quote was $1000.
So it would actually more expensive than buying a brand new one from my local dealer.
I'm not desperate for one, so maybe I'll have to bide my time for a used one closer to me.
If I had plenty of time on my hands, I'd grab my little 4x8 utility trailer and go.