I've got a CB550 Amen Savior frame..looks like yours. Here are some measurements. There is no room to adapt a CB750 into it. The CB550 Amen Savior frame is quite rare. Hope this helps. ;Clifford

http://s258.photobucket.com/albums/hh280/23tbucket_2007/?action=view&current=PB010060-1.jpg&t=1207401264594

http://s258.photobucket.com/albums/hh280/23tbucket_2007/?action=view&current=PB010061-1-1.jpg&t=1207401830376