Dash type or Home Theater.
You really do not need an installer as such for either one.. Just a compatable unit or and adapt-a-kit.... Cruthcfield dot come if I spelled it right. Very large catalog of audio stuff. JR Music is another one.
Considerations: Dash radios are usually DIN, Double DIN or Triple DIN (The numbers 1 2 and 3 refer to the height of the unit) Get the same size.
The "Adapt-a-kit" is plugs and cables. You unplug the speakers and such from the dash radio and plug into the "kit" cable. and plug the "kit" into the radio.
House radios (home theater) you may not need anything but the box
Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times