Amazon.com: Boobrie UHF Female SO239 4-Hole Panel Chassis Mount Flange Panel Mount Adapter Solder Cup RF Coaxial Coax Connector Adapter for PL259 Male Plug Pack of 2 : Electronics
Flange Mount Brass UHF SO-239 Female Jack RF Panel Connector 4 Hole – Envistia Mall
Uhf So-239 Female To Uhf Pl-259 Male Right Angle 90 Degree Rf Connector Adapter - Connectors - AliExpress
CHASSIS MOUNT UHF CONNECTOR, SO-239 | All Electronics Corp.
UHF SO-239 Female to UHF PL-259 Male Connector Adapter for Ham Radio | eBay