I don't think any cartridges are marked with this spec that I know off. If it helps the 9L body is gold compared to the others that are silver. The 9l has a clear acrylic frame for the stylus, 9E green frame, ruby red frame and I think there is one with a blue frame too.
I think what people are trying to tell you is that the difference between 3.5mV output and 5.5mV output is not going to make or break the match with the gain of your preamp. If your preamp works with only 3.5mV in, it will work fine with 5.5mV, and vice-versa. For that matter, it will work with any and all "normal" MM cartridges. The diff between 3.5mV and 5.5mV is less than 2 db.
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