Couple of comments: Do you have Tractor Supply or True Value Hardware there in Quebec ? Down here in the states both of them carry a pretty good selection of bolts, both metric and SAE and grades 2, 5 and 8. I should think that NAPA auto parts up there would have them too. I have found (mainly with 4 and 5ft bush hogs on Kubotas with no slip clutches) that shear pins must be a very tight fit, almost an interference fit, in the holes. Otherwise they shear very often. Tightness of fit is almost more important than shear pin diameter.
I run a 5ft blower on my
B2150 Kubota (rated 24hp but one of the older 4cyl models and it seems those older horsepowers were better horses for some reason.)
BY THE WAY my
B2150 has a creeper gear which is a big help for snow blowing -- that is about my only use for the creeper gears. With the creeper you can just go as slow as you like and "let 'er rip" where in the non-creeper gears, even low gear is too fast for packed heavy snow 2 feet deep.
Anyway, I have delved into some heavily packed deep snow and never lacked for power with the 5ft rear mounted blower. I have no where near the snow you guys deal with up in Quebec (actually I like to go up your way to FIND snow for skiing!) BUT many times when I do have to use the blower it is because the area around my "cabin" has been neglected for several snowfalls and is packed with tough, heavy & often crusted snow. I've never used chains but got them for front wheels only, just in case. Mine is level ground for the snow blowing application and I found that ag tires made a huge difference compared to the turf tires I used to have on the
B2150. Turf tires look great being so wide BUT the instant they spin a turn or two there is nothing but ice underneath & I am hung. Ag tires rarely have that issue, or much less anyway. My thinking is that the front chains will give me enough extra traction to avoid being stuck. Not sure that would work well on your steep driveways. At least on my
B2150 there is not enough room for chains on the rear & spacers would be needed BUT you have to be careful if you have a belly mower -- if the wheels are out too far they won't clear the belly mower. Measure before you buy.
Good luck and let us know how your snow season goes.