There are four actually. Because the the gsr one is shorter also.
90-93
94-95 o2 sensor next to the oil pan<----0one I need. I don't need the top of the header.
96-up o2 near head
gsr shoter length

I have a 94 integra ls I am triing to keep stock. The left bolt hole on the cat is down and the right hole is up. I have the opposite. Let me know. Thanks.