I agree,Trac-vac works great with a BX for sure.The boot will not be cheap I think I saw one on e-bay for a 54" deck new with a buy it now for $135.I run their model 880 behind my Bx2230 a love it. Good luck,check your prices this time of year used is at a higher price and demand is up always in the fall
I have a older Trac Vac 580 on my BX24 with a 54 inch mower, works good. Much cheaper to buy the Agri Fab boot and chop it up to fit then to get the Kubota boot. I was even able to make a mount that allows me not to remove the Kubota guard to put on the trac vac boot. I will try to get some pictures tonight. And try to find that part number.
Heres the part number and website (note the website does not work using Firefox but M$ IE works)
Agri-Fab at 217-728-8388. Part number 43830 https://www.speedepart.com/index.aspx
Just for everybodys info, you can get a 6" boot from TSC for about $40.
You have to cut the opening to fit your deck, but its real easy.
It works pretty well. I used mine for my Trac-Vac (not sure which model) and although it clogged a few times, it beat the heck out of raking all those leaves - plus it gave me seat time on my BX2230.