(the offer still stands.) Believe me; if you send me what you have, including what works and what doesn't, I WILL return to you a full complete working set that works for you.
I have been doing this a while (only a year) but I like to try everything. I have parts that fit the: 306, 510, 901, 801, 401, blu, ego, vgo, etc. And if it doesn't fit, I have adapters. The ecf group that I belong to- that's what we do. We help each other, so I buy in bulk, and I trade and swap and give often. I can help (and if I can't, I know where and how to find what you need)
But if you don't want something that works, I can't force you. Personally, I wouldn't have gone back to someone that sold me discontinued parts, or that knew less about the product than I did. I go to local stores to either purchase something *I* know I want, or something that I need assistance purchasing. If the store owner/clerk can't help me, I do not return. That would be my mistake.
Now, on your topic; yes it is convuluted. Yes, in order to know what you are doing, you do need to learn.. but as many people have pointed out.. that is not all that unusual. Even when I go shopping for a pair of jeans.. I still need to know the terminology and the various brands! I can't even order a pizza without being asked if I want stuffed crust, thin and crispy, pan, or papa mia. Then they ask if I want flavor on my crust.. well what kind? Cajun, garlic, hot n spicy, herbal, butter cheese or extra special..? What ever happened to plain??
No matter WHAT you buy, no matter where you go.. there are going to be choices. Some of my favorite items get phased out, because there weren't enough people that liked the 'type' I do. Go into any store, and Jergens lotion will have 6 different choices. (at least) and that's just one brand. How about milk? Skim, 1%, 2%, whole, chocolate, etc etc etc. My kid likes Silk Milk, Very Vanilla (not the regular vanilla, mind you) and that is the ONLY kind she likes.
There is no way that the manufactuers will put out only one standardized version. Not going to happen. So it boils down to "what can you do now?" You HAVE to be willing to put out a little effort or you are going to fail or pay more. You have that choice as well.