I just got a mix of 12 cornies. About half cornelius and the other firestone. I know cornelius keg parts are easy to come around, but what about the firestone kegs? Most of the firestones are challenger VI. I know the posts and poppets are different, as well as the threads for the posts. I have also found them. My main consern right now i guess would be that damn plastic co2 dip tube. Does anyone make them? Or maybe a SS one? Or could the hole be drilled out to use a cornelius co2 dip tube? One last thing, o-rings and seals. Are they all the same? From what I've seen they are, I guess I'm just looking to see what other people have done.