All the regular replacement parts suppliers stopped making them several years ago, leading to hoarding as well as hoarders cashing in.
The only other one I know of is the taller K&N, the 3840.
I always thought the taller element looked cool and it might make enough of a functional difference to be noticeable.
https://www.summitracing.com/parts/knn-e-3840I had collected three NOS Fram filters that had the shield with round holes and sold them off recently, replaced them with a 3840 for a project later and had a
few hundred left over.
