Well from what I've found out the problem is that they didn't make any B16A OBD0 engine in the US and all after market headers are made for OBD1 which they did make in the US. So I've been told...
Now I'm researching to see if we couldn't use a OBD1 O2 sensor because it was a 4 wire sensor and we had 2 O2-sensors that were 2 wire... I'll let you know.