Mike,
Mark told me you do have have the early 13" OD .75" cross section elements for the early Quella filter assemblies. There are fewer std .75" K&N filters to choose from than the .875 cross section. I sent Mark a pdf file from a custom B302 filter and induction system I put together some time ago. He cut a couple copies the lid and base for me. The file has the filter element splicing procedure that I've found most reliable. -Good luck.
Best,
K
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