Ok, sorry, I should have been more clear. The E2c's were made by Shure, and have a sound tube that's about the same diameter as the super.fi's. As far as the molds, UM56's are the custom eartip (they just go into the canal) made for Shure earphones. I had the impressions made by my audiologist, who sent them to Westone to be made (in other words, I did not use this vendor). Now, I could be wrong, but I thought that this vendor also used Westone to create the actual molds--Westone does molds for a lot of different companies. So I took these molds (which were not designed for the super.fi's) and popped them on the super.fi's, since they fit on the end. Now, even if both molds are made by Westone, it still may be irrelevant, because you said this vendor had taken some time to develop molds specifically for the super.fi's. I can't really tell you how they sound, but I can tell you that the molds made for my E2c's sounded sub-par when used on the super.fi's. Hope that helps. If I'm still not being clear, let me know; if there is anything else I can answer, let me know that too. One way or another, if you get the molds, post your impressions. There have been other threads where people have decided to use these guys for molds for the super.fi's, but I've never heard from them after that.