I recently installed this kit on my
BX2370-1. Thought I would give a few pointers about the different kit part numbers and how my install went.
First, I got BX7376. This is the rear aux kit for the 70 series (NOT the -1). Rather than take the kit back (as I have the -1) I just figured out what was different. If you remember, the 70 series has the wide belly ROPS. The -1 went back to the straight ROPS. The rear aux coupler mount is the only difference between the two kits. I simply cut-and-welded my coupler mount so it would work.
The other issue I found, and this is a problem with the kit(s) not being up-to-date with tractor changes (not related to -1), was the rear hose. Back in the pre -1 70 series, Kubota changed the rear steel tube/pipe (the one that runs from one side of the tranny to the other side, around the PTO area). When Kubota had the steel pipe, the pipe went into the right side of the transmission into a short fitting. The rear aux kits expect this. When Kutoba went to the rubber hose, they replaced the short fitting in the transmission with a 3 inch long (or so) gray fitting. (I assume the reason for this was to reuse an existing hose in their supply chain that was too short.) In any case, that 3 inch long fitting must be replaced with the short fitting in order for the kit to work. Neither the online IPL nor my hard-copy IPL shows this 3 inch fitting (even though they show the rubber hose). (It turns out the fitting is the same one as one in the kit, so I "borrowed" one from the kit to move along in the install process. The location that I borrowed from the kit was easy to get to (once that part came in from ordering) after most everything else was done.)
So... BX7327 for earlier series and 70-1 series; BX7376 for 70 series not -1.