UV filter + front cap: 40.5mm, 49mm or 52mm - SovietCameraStore.com
Tiffen 52mm UV Protector Filter - Walmart.com
Tiffen 52mm Uv Protector Lens Filter : Target
NiSi 52mm PRO Nano HUC UV Filter | NiSi Optics USA
Amazon.com : 52mm HD UV Filter for D5300 D3500 D850 D7500 Camera w/AF-S DX 18-55mm f/3.5-5.6G Lens, Fire Rock UV Filter for Canon EOS 90D, Rebel T7 w/EF-M 55-200mm 18-55mm Lens -1