My grandpa was a pack rat. I've got all sizes of bits and things. Let me know what size you need and I most likely have it. Just take a look because there is too much to mention. The earls line is 4an and the filter is new.

 

Here is a link to a turned velocity stack and filter that I have not sold yet either.
https://www.miataturbo.net/forums/showthread.php?t=9926