What you looking for is a lock lever and locking tabs that are available from Positronic. Catalogue available at http://www.connectpositronic.com/?media_dl=2293 , page 28.
These usually require that Positronic backshell is also used.

They are excellent connectors. There are many distributors.
Robert

On Thursday, December 17, 2015 at 9:04:35 AM UTC-8, Six-Seven Romeo wrote:
Wow. That got messed up. Lets try again.

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@Charlie M. This isn't the very common simple screw type of secure connection for D connectors. On the Becker radios there is a slide as part of the radio's male D connector that engages "studs" on the cable's female D connector.

All - I found that both Dittel and Becker use the same latching mechanism and Cumulus-Soaring.com has the Dittel version of the female D connector.