What is a "stage clutch"?

Clutch parts are interchangeable between all '92-'93 B-series transmissions. So if you get a B16A transmission, you need to make sure it's from a '92-'93 car if you want to use your current clutch in it. If you use an older '88-'91 B16 transmission then you need to use a '90-'91 Integra clutch and flywheel.