Need a skinny o2 for a redtop sr

Im haveing some trouble getting my sr to run right and i just found it has a bad o2. I tried calling all my local parts supplys with no luck so figured i should try here.

thanks

text only 519 two one 7 zero eight 8 four

Order a NGK 1987 Nissan 300zx turbo I just bought one for mine for 45 bucks, brand new!!

DONT CALL THE DEALER WAY TOO MUCH!