Offered here is a brand spankin' new Pro 5R air filter from aFe. This is not the Pro Dry filter but the oiled one. This fits the aFe series of Cold Air Intakes and as such also fits the 1st generation TRD CAI. I'm not sure on others but using the dimensions taken from aFe you should be able to tell if it works or not. The lowest price I could find online was $67 shipped so I'll take $55 including shipping on an item that rarely if ever goes below $67 shipped. Save a few bucks and buy from a fellow TacomaWorld member.
Specs from aFe:
aFe Power MagnumFLOW IAF PRO 5R Air Filters; 5-1/2 F x 7 B x 5-1/2 T (Inv) x 6 H in (IM)
"With five layers of progressively finer mesh cotton gauze media between 100% polyurethane top and base, this high flow “oiled” conical performance filter provides excellent airflow for maximum horsepower and torque. Washable and reusable for multiple cleanings, the tall, open, evenly spaced pleats provide excellent dust holding capacity for longer service cycle between cleanings. Pliable polyurethane flange with integrated bumps insures tight, no leak seal over the life of the filter."