i am not sure about the numbers as i have a sam's photofact for the 70 models , and that starts with a 72 instead of 69. don't know if they changed the numbering system or what. either way , the 68-72 big car radios (bonneville , catalina , executive((these are the b-bodies)) ) have chrome pushbuttons while the others had black ones. they come up on ebay a lot for comparison purposes. hope i answered your question in this somewhere
