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 .
Just wanna say thanks to all Skyline Owners for turning up for the AutoSPA night. It was a great night.....we got free food, free tour, free show, free...ahem..........