[Jack m]

Must be am fm.
I think the number is 366.
Rebuilt or perfect preferred but a core might work if its clean and can be rebuilt.
If you are a rebuilder and have parts etc. it would probably be prudent to replace the speakers as well.

 

[Scrounge]

This one advertises a 367:

AM/FM Radio 1965 65 1966 66 Dodge Polara Chrysler Newport New Yorker 300 (at https://www.bonanza.com/listings/AM-FM-Radio-1965-65-1966-66-Dodge-Polara-Chrysler-Newport-New-Yorker-300/500062720?goog_pla=1&gpid=18283950120&keyword=&goog_pla=1&pos=2o1&ad_type=pla&gclid=EAIaIQobChMIp8KjvtKE1gIVZpPtCh1nPABYEAQYASABEgJLjvD_BwE )

A very pricy 366 -- the ad is old, so availability is questionable:

[FOR SALE] - 1965 Plymouth factory AM/FM radio (at http://www.forabodiesonly.com/mopar/threads/1965-plymouth-factory-am-fm-radio.319736/ )

This is an AM radio, but the seller has other radios, so he might be worth contacting:

65 66 Chrysler factory radio Good working & warranty Very Nice (at http://www.ebay.com/itm/65-66-Chrysler-factory-radio-Good-working-warranty-Very-Nice-/222618672217?hash=item33d51b5c59:g:y2IAAOSwk1JWcc~i&vxp=mtr )

 

[Jack m]

Thanks for this,
I found that the stock am only had a dash speaker and car is not wired for rear spkrs.
I found a guy that installs a chip that will change over to fm by quickly turning the radio off and on again.
This will convert the tuner. A bit of channel searching on the wrong dial and then set three of the 5 push buttons to save three chosen channels. (three of the buttons will be converted to do this).
The good part is that its still original and looks absolutely stock.

 

[DC-93]

ebay.