Radials will be excellent on that tractor and you now have something legendary. I've put them on tractors for years and they are impressive performers. There is a recent thread on adding them to my
M7040. The fronts were not readily available and won't come in until fall. While Firestone 9.5 x 24R's are widely available in Europe and Canada, not so in the US and the only ones I could fine were BKT from India. From what I've read, they will be fine. I looked and yours are highly regarded. Are the rears the same brand and did you have much trouble getting them through Kubota? Do you happen to recall the extra cost?
Not sure if you have used them before but I keep mine overinflated for the first winter kust to make sure everything stays seated. Maybe 15-18 psi. Then it's back to 7 to 9 depending on use. It's like adding 15 or more HP to the
M7040 and yet you can float over wet area or resist compaction easily. Wise move for you to get radials.