The collector is in original parts and can be installed directly to the original flexible, and fits perfectly and does not need any modification to be installed.
It 'also the connection for the lambda probe in the usual series of position.
Check the shape of the head flange (circular ducts) if it is the same form of your collector.
Alfa Romeo 75 Twin Spark 2000 stainless steel exhaust manifold with aspirated electronic injection 4-2-1 as a replacement, complete with everything and reaches up to the central unit as shown in the photo.