i'd only be interested in the upstream O2s for a 1999 2.5L Cougar. will this be ongoing for awhile?

1999 Cougar V6 MTX Borla stainless, dual exhuast ST200 struts, rear strut tower brace Roush springs, rear sway bar, bodykit Steeda Tri/X, Powerslot rotors, Falken Ziex 512 Awaiting install: GMK CAI