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If you want a quick fix, just use your original 1wire sensor. The blacktop ecu doesn't have a ground for the o2 signal, so that wire is just grounded into the harness on one of the main ecu ground wires. The only difference with a 1 wire is that it grounds to the exhaust instead of the head, and, of course, there is no heater element.
Now, you will still get code 21 for lack of a heater element, but the ecu still seems to accept the signal.
If you want to use a normal 4wire o2, a previa or 4runner o2 works fine. Both are the flange mounting type. If you want a screw-in type, late nineties camrys work too. The wire order for all these sensors are the same. At most, you'd have to trim some of the keyways on the o2's plug.
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