Funny, we've been trying to figure out what the deal is with my wheels and brakes over on another forum. Come to find out the po put '78 cb750A wheels and brakes on my '76 cb750K. Apparently, '78 A's were the only bikes that had comstars with a single disc up front and a drum setup on the back. Think I'm going to end up putting duals in the front off a 77 or 78F. Right now I have it down to the frame and will be starting the rebuild soon. The tank is a '76 K I think. After I tried resealing the inside and repainting the outside I found out, it still leaks! I think I'm going to put a 76-78F tank on when I put it all back together.