Downpipe, cobra head

[Tsgs69400]

Anybody know what size and type of flange the factory uses such as with the cobra head? Also, will it match up with an s300 outlet?
If anyone knows and has one i may be willing to buy it for a project.

 

[PasoF450]

I have a couple of the cobra down pipes that we took off when we installed new turbos. PM Me