Seems like the old filter style with the top crimp is not availalbe at FLAPS but it is around on EBAY and inline tube. Here is what is on my 66 401 now... I don't think that is correct. I have some old 3/8" single inlet dual outlets for a Chevy the diameter seems correct but not the outlet/inlet size. 5/16" inlet and outlet and a diameter of 1-7/8" should fit. Found this topic on the subject: http://65gs.com/board/index.php?action=post;topic=301.15;last_msg=9810 AKA: Part numbers: AC Delco PN GF-61 or GF-94 INL14497 https://www.inlinetube.com/products/inl14497 Ebay: https://www.ebay.com/itm/193706079045 GF-94 https://www.ebay.com/itm/184912945883 Wrong one at FLAPS These should work.... and fit correctly