I used the outside holes for the battery box and the holes for the tool tray to mount mine. Used Delrin spacers to get the seat level with the rear tank mount.
Heres a pic of mine. If you want more detailed pics let me know.
1974 Kawasaki H1 500
1976 Honda CB 750K
Heres a pic of mine. If you want more detailed pics let me know.

1974 Kawasaki H1 500
1976 Honda CB 750K