What I normally do if i want to get factory part numbers, I try one of the online catalogs for suzuki and then I check the aftermarket sites like bikebandit. try this https://www.suzukipartshouse.com/oemparts/l/suz/50d0a4aaf870022c2c53496c/1995-quadrunner-lt-f250-parts
Then you can take the part number and do a google search to see if there is a less expensive version. So the air filter looks like a part # 13781-19B00 which on that site is $20.47
You can also punch that number into Amazon and you'll see a bunch of lesser expensive aftermarket filters available
So depends on what you want to spend and what parts you want, the older machines have aftermarket parts usually available. The plastics i would see if there are used ones on ebay or hunt around online to see what the best price is.