I'm curious...did you run a VIN check from CarFax (or comparable service) before purchasing your used Corolla? If not, it might still be worth it to you to give you the vehicle history, if not just "piece of mind". Last I checked it was $25 for a single report or $30 for a 30-day unlimited use.
I have a '97 and can tell you they are completely different body styles. Mine is the '93 - '97, you have '98 - '02. Many mechanical parts are very likely similar. The dashboard and its layout is definitely different.
The guy at NAPA might be right. Wow, I could fine one either for your year range on
amazon and a couple of online auto part warehouses.
Is your odometer analog or digital?