I bought both the Pannier set as well as the racks to mount them on my 1976 850-T3. Both are constructed pretty well. And look like the original bags that were availible back then.

But there is no hardware included. And no mounting holes provided on the bags. No instructions even. So to mount it on the bike and mount the luggage on the rack you are going to have to engineer a solution. So do not expect you will be up and running with these right away. No hardware kit is even available anywhere.

Also, the panniers seem to be molded in two halves which are somehow bonded together. This seam lacks black gel coat so to solve this problem there is some think vinyl stripe covering the seam that goes down around the bag. Which is not a real solution. For me I plan to paint the bags as well as coat the inside with something like a truck bed liner spray or something similar. Because the interior is just raw fiberglass and you would want to finish this with some sort of liner.