The McIntosh MX5000 looks like my old Sonomatic AM radio from my '63 Riviera, and the only deck I know that cosmetically integrates very well with older Buicks.

http://www.mbd-indo.com/Product/McIntosh/Mx5000/Mx5000.html

Where do i buy one of the radio's for my 1963 riviera
JIM 678 687 6866