Baader 2"/2" Inverter Ring with 48mm filter thread - M48 Adapter System - Adapters & Imaging Accessories - Accessories
Amazon.com: NIBBI RACING PARTS High Performance Air Filter 48mm Motorcycle Air Filter Replacement Air Filter Dirt Bike Air Filter GY6 Scooter Air Filter (A3-48mm) : Automotive
Lumicon Oxygen III 48mm Filter (Fits 2" Eyepieces) LF3045 B&H