It is 78" wide, so very similar in size to yours. If you want to measure your steel thickness for reference here are my specs...
http://www.landpride.com/ari/attach/lp/public/specs/305-054s.pdf
I really wanted the highback version simply for more weight, but just couldn't find one used. I bought mine used as well for a third of the new price.
I imagine your specs are probably in line with the highback version in the link I posted, although note that it is 84" and not 78" like mine is.
Your tractor is going to have it's hands full with that box blade! Just remember if it is too much with all the scarifiers down, you can always lift a few up and only use the middle ones if needed. Does yours also have a hinged rear blade? I can bolt mine in the "fixed" position but I've never done so, I find the swinging rear blade pretty helpful in allowing me to dig in more, but then again, I have nothing to compare it to :laughing:
Roger,
I paid $1300 for mine shipped just as reference.