You might try digging thru this site. http://www.outerzone.co.uk/index.asp

Mount the wings on your plane,then take some cardboard and make a template that fits on top of the bottom wing and up against the bottom of the top wing. Once you get this to fit nice..take your time. Then you can slide it out to the missing strut locations, and it should be the right dimensions. mark where your mounting points on the wing touch the carboard template.Then draw lines representing the strut sticks on the cardboard.. you have a perfect pattern !