Understanding that this post is old, I figured I would just add the answer to this question for other users.
For B2620 and similiar model tractors, you will be looking for the B2765A or B2775A Snow Blades, and you will then need the B2733 quick hitch. (2 seperate items)
You will need to remove two bolts from each side or your FEL Frame to install brackets for the quick hitch, and in many cases, I have seen that these brackets are not sold with the used quick hitches.
You can find the Brackets on Messicks with these PN's; 70060-02152 and 70060-02153
I should point out that I purchased this setup from a guy using it on his 2001 B7500, and it bolted right up to my 2013 B2620