I had a brain fart & remembered
@Travis8352 dug out some Fleetguard Oil Filter cross references last year from their horrendous website. We have a solution, I think -
I remember discussing it - it is an unlabeled Stratapore wound microglass (they seem to quit pushing Stratopore in favor of their latest Nanonet wound polypropylene plastic string element).
It is equivalent to Royal Purple 20-500 & Fram XG/FE10575 midsize oil filters for Hemi engines. It shows it is still in production. Imma try to go git some....
OK - it's in production and for sale. Truck parts places have them, RDO in Minnesota or from Cummins direct, link below. Efficiency rating is 90% @ 21 microns. The real deal. Go get 'em!!