[striker3]

The last one I believe is the front bank O2 sensor, which I dont believe exists on the 94 SL if it has the federal emissions but the connector is still tied up in the harness.

 

[striker3]

The fed spec connector is a 4 pin straight connector. BUT you might be correct if it's a Cali spec car, because they do use a 4 pin square connector.

That is for the left bank, which is the rear bank and the only one used on Fed spec cars IIRC. The right bank (front) is only used on the Cali spec cars but I believe the connector is still in the harness and would be the square connector.

 

[striker3]

I think the FSM (page 113 in volume 2 of the digital copies for 92-96) means "(front)" as upstream of the pre-cat and "(rear)" as downstream for the individual banks, Left or Right.