To keep my stock simple I do dual rounds in every size /5mfd. Then ovals of every size up to 20mfd. If I get say a 30/3 or 45/7.5 I just slap the compressor on half the dual and the fan on a separate oval. More often than not it seems like condenser fan motors are 5 mfd, so it works out pretty good. Since most blowers seem to have stock ovals having the smaller size in ovals keeps me from having to make brackets, same with a/cs most of them are round.