Kubota D1005 engine. Not mine but might be right for someone.
https://seattle.craigslist.org/est/grd/d/seattle-kubota-d1005-engine-low-hrs/7800829903.html
I just posted pictures for the mower deck and noticed you have a B7100HST and this deck is for a B7100D, a gear drive machine. Are you sure this is what you want?
Here are the pictures. Let's make sure it's what you need 1st. I have the mower manual that shows how it's assembled. I assume you already have the front clutch assembly, or do you need that too?
I have a B7100 belly mower that I don't use but don't know if it will fit. It is a used B3048 mower that came with my tractor but was removed before I purchased the tractor.
I have a kfud 110 plow blade for my b7100 and I need a control valve for the setup. It has hydraulic up/down and side/side. I believe it needs a 2 spool valve but am not sure what flow. Do you know if your valve will work, and how much do you want?