1993 single wire Vin # L,1
GM# 25162693 (AC Delco #AFS-20)
$26.40

1993 HTD Vin # L,1
GM# 25312185 (AC Delco #AFS-76)
$34.07

which one?

Does your O2 sensor have one or more wires? You tell us which one ;)

You may wanna check the dealer for it too, I have been surprised lately at how competitive the dealer has been on parts.

Don't waste your time with anything else other than Ac Delco. Alot of parts that were changed on the Bonneville since it was put back on the road in Dec have been from the dealer and Ac Delco too.