Yep, It's all on a computer program. I still have a NAPA nearby that hasn't thrown their catalogs out. There's a couple guys there that know how to use them as well. THat combination is holding that store together. "Call Barry" !
When I sold my businesses to Carquest 22 years ago, I brought home most of the pertinent catalogs. Still use them when I need them today. I brought home especially the catalogs on brakes and ignition and front end parts for older cars.