Coaxial straight connectors

I need a straight 4mm coaxial cable connections
1 female and 1 Male so I can get the stereo in my car to work. Then a falk connection.

The top one is the type of falk connection and the bottom one is the type of connection I need for the 4mm coaxial cable fittings inline/ straight.
I’m disabled and use a wheelchair because of a spinal cord injury and now been diagnosed with thoat cancer. I can’t speak loud enough to use a phone and eat solid food. I do have a blue light card for services people who need help with products and services.

Me and my wife need this for out satellite navigation system to work in the car. As my wife will be able to get me to treatment’s and appointments with specialist. The garage we use have told me that thay will fit the parts is I can get them. This is where i need your help.
Thankyou very much for taking the time to read my email. God bless you all and keep you safe and well.