02 sensor tundra 1 gen

Hey guys, I know how to replace the p0031 bank 1 sensor 1 but I need some help in actually purchasing the part. I should buy a denso sensor correct? Is this for bank1 upstream? When I go to rock auto or amazon I'm very confused as to what the actual sensor I need (laugh away) any help would...

Hey... I'm in the Dominican Repub. and bought an imported 2000 Tundra 4.7L from the US. Turns out is has the 02 sensor error (bank 1 sensor 1). So... am not back in the US for another couple of months... and could get the parts there and bring them back to do the job myself... or so I risk...