Here is a link to the Buick Master Parts Books (1972 Edition) that cover your car. There are also several other Master Parts Books for other GM brands on that site.
Once the original part number is known, I Google "Buick 1234567" and "GM 1234567" which pulls up all kinds of leads. Pretty soon searches lead to the www.gmpartswiki.com site which is powerful for searching by part numbers.
To locate cars in wrecking yards Google "parting 65 LeSabre"
Last edited by TODD; 02-03-2018 at 01:25 AM.
Reason: grammar errors
What has been, can be again. (Bob Wills, 1942)