The first link does not apply to the earlier 2 Litre models, but is more relevant to 405/6 onwards through Chrysler V8′s etc. This and other information has kindly been donated by Per Blomquist and comes from a Motor Trader article from May 1958. It is reproduced here so that the technically minded can get a better understanding of how things work. The second link is an article by Phillip Herbert.
Time and technology has no doubt overtaken the types of radio originally available, but the fitting instructions may be of interest to those who do not yet have a radio fitted. Ongoing research is also being undertaken in regard to digital radios etc., and when this information is available will be included here.