don't quote me for your "AC-S6", but the one in my canister [add on type that hangs on the manifold] is a Purolator L30034, and in brackets below that number it sez: (replaces P34)
gettin where ya can't depend on them youngsters at NAPA anymore, tho my local still has some old books - gotta make a list for my truck as I need/find the part numbers
Bill