Just type in the "actual radius" or C-E dimension of 9". In the past you could type in the radius dimension. The SIF and Flex factor will be close enough. The code SIF and Flex factors are still approximations to start with...

Additional note: Victaulic couplings can rotate unless you specify the Anchor type. Hexagon/Coade had an article to model these like ball joints with rotational limits etc.