The FS1BNC is Mini "BNC" type connector that fits most brands of 24-26AWG coaxial cable.
Calrad 30-291 Gold Plated 75 Ohm RCA Plug for 2.8mm Cable
Calrad 30-291 Gold Plated 75 Ohm RCA Plug for 2.8mm Cable RG59 / RG179 Solder Type
Calrad 30-300-WH Gold Plated Chassis Mt RCA Jack - Red Insert
Calrad 30-300-WH Gold Plated Chassis Mt RCA Jack - White Insert
Canare F-09 Narrow Profile RCA Plug