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 .
Done using 3/8" thick plywood... bought from a hardware shop near my place in serdang... de board itself costed RM35 n RM5 for transportation... measuring 4ft x 8ft...