ok I found c4ze 8005 YI 5bc on internet so that will probably the rad number that I need to search?
Your '66 most likely had a C6ZE number, which is why it's best to wait for more input.
5BC would be the date code, 5-1965 B=February C=3rd week. These numbers should be on the side support for a Dearborn/Metuchen car and embossed on the top tank for San Jose. The Dearborn/Metuchen will also have 'DEP' stamped before the number and San Jose with 'W-MO'. There are differences between 65 and 66 radiators, so those details will need to be determined based on your cars' production date.