Salvage yards use the Hollander Interchange Manuals for identifying parts swaps. Those will pick up interchanges that have been proven to work even where part numbers are not the same.
A MOTOR Parts and Time Guide from the early to late '70s will show crossovers for common mechanical repair parts. Those show up used on eBay. Chilton's Labor Guide and Parts Manual is similar. For body parts, a Mitchell Collision Estimating Guide is a good source.
The actual GM divisions' Master Parts Books from that period are available to download at www.wildaboutcarsonline.com It is handy to just pull the part number from the Buick book and Google it along with the word Buick and then with GM.
www.gmpartswiki.com has many GM parts manuals (mainly Chevy). It will find multiple usages if the part number is already known.
What has been, can be again. (Bob Wills, 1942)
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