they will fit in to b16a ,
The manifold are one piece type , from the top header mount to the catalys adapter ,
if this o2 sensor wont fit to your plug , you could use your stock o2 sensor .
hi all..me from jb..would like 2 now how 2 install oil press n oil temp for my car.. for ur all info.me use new saga lmst carb(4g13p)...wonder if i can use those meters...