RE: ultra sport 60 need c off g
You are thinking of the Super Sportster series. They made a bunch of those(.20 .40 .60 .90/1.20 .40bipe).
The US only had the .40 .60 and 1000. The .60 is a great plane. I finally retired mine after 7 years of hard flying. It was a blast with a ST .75.
David