If it is the coaxial jack for the mobile scanners with the female center look for a Philmore 214.
The plug is Philmore 265 and plug with molded wire is Philmore TC265
Philmore 214 DC PCB Mount Jack and 6.5mm x 4.35mm Mate Plug-No.265 is also know as a EIAJ-05 this is a Japanese standard plug for 13.5-18v.
The newer GRE and Uniden handheld scanners also have EIAJ-02 and EIAJ-03 for 6v and 9v The EIAJ-04 looks similar to the 05 but is smaller in size and covers 10.5-13.5v.
Website with picture and for sale.
Philmore 214 DC PCB Mount Jack 6.5mm x 4.35mm Mate Plug-No.265
AR3000,5000,8000,8200,8600,SDU5000,5500,ARD25 R10,20,71,72,75,7000,7100,8500, PC/R1000,2500, PSR500,600,800,PRO18,668,2035,96,106,197,BC760,796 ,996T,996XT,396T,396XT,HP1,HP1E,436HP,536HP