I just replaced the bandswitch wafers this weekend on the AL-80A using the AL-80B bandswitch purchased from Ameritron. I just replaced the wafers not the whole switch. I only had one bad wafer but decided to replace all three. Two of the wafers are exactly the same as the originals. The one in the middle is slightly different. The difference is that the solder positions are moved slightly on the wafer. It's functions just as the original but requires you to re-adjust the wiring a little and add an additional lead. I'll see if I can put some pictures up on the web and update the post so you can see what I'm talking about.
Fairly easy installation. Took all Sunday to do it though. Now I have nice new un-tarnished contacts!
If you have any questions, please feel free to e-mail me.