Sorry I know its a bit confusing. The difference between those parts are one is mirrored. You need 2 of each. I have a list here, http://www.vicious1.com/blog/parts/
I need to go through and clean up the names a bit but I am working on getting out all the new parts first. The IE and "F" are the same version, 25mm. I have three versions now 23.5mm=C, 25mm=F, 25.4mm (1in)=J
Let me know if I can clear anything else up. This is good feedback I will find a way to make it easier to understand for the newcomer.