Lexus SC300 O2 Sensor Identification

I can’t find docs to id the location of the O2 sensors. I know where they are but I can’t identify what is Bank 1 (forward?). If bank 1 is beside the first firing piston I need to identify it (can’t find docs for that one either). This is a SC300 6cyl produced in Aug of 1996, but called a 1997.

You have an inline 6 cyl. there is only 1 bank of cylinders. A V-6 has 2 banks. Starting at the cylinder head you have bank 1 sensor 1 then further along the exhaust, bank 1 sensor 2 and possibly a 3rd one.