Ok I got into it tonight and upholstered the seat. I started by drilling out all the rivets that hold on the old style tooth crimps around the bottom of the seat. Then I cleaned the plastic bottom and lined the edge of the plastic bottom with duct tape. Then I busted out my trusty upholstery stapler and hit it. I'm happy with the results. I bought one of these Ebay seat covers for my 71cb500 and it didn't turn out as nice as this one.