I'd like to add a word of warning here.
First, the newer B tractors like the B7800 & B2410 uses a different mounting kit than the older B models like the B2400. Yes, that's right, the mounting kit for the B2410 is different than the mounting kit for the B2400.
Second, the three way valves are different than the four way valves. When pricing the blower, tell the dealer what type of valve you have. Or better yet, give the dealer the model number of the valve so they can look it up.
Third, installing the blower on a tractor with a FEL subframe will or may take longer, initially. This depends upon the age of the subframe. Older subframes are missing a hole for mounting the blower. I've seen a couple of newer subframes that have this hole in place. My 1998, LA351 FEL subframe did not have this hole. The instructions helped me drill it. It's a tough hole to drill, but I got both of mine done correctly in about an hour.
Fourth, it will take a few hours to get it all put together. I'd say about 3.5 hours max for mine (now that I have done it once). So if a dealer charged $55/hour and booked 3.5 hours, that would be $192.5. So a price of $2850+tax, for the dealer to install it might be ok. But if no drilling is required, then take 1 hour out of the equation. Which gives $137.5 ontop of the $2600. So that's: (137.5+2600)*1.06=$2901.75 I paid 2600*1.06=2756.00 and did my own installation.