Hi, The "highway hifi" factory option code is 345 on
the 1957 data (radiator) plate. Remember that you must read this number in
column (see exemple on http://www.ifrance.com/c-i-f/dataplat_us.htm). Seems
that ther's a lot of "345" code on '57 Imperial data plate but Chrysler
Historical confirms that 345 is well the hifi phonograph...
For '56,
it's " 5 & 7 " (???)
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Philippe COURANT (Pau,
France)- Webmaster des sites ACCF et C-I-F