My van is a 1985 with a DH1.9 injection engine. The section of pipe from the silencer to the manifold pipes has a large break in it.

In the exhaust section of the Wiki the pipe is part 20049 and its connected to the manifold pipes by part 20049G - I believe these are GSF part numbers.
My problem is that my van doesn't have these two pipe sections it's all one piece.Aso the Wiki diagram doesn't show part 20049 as having the lambda sensor hole/nut.
I've also checked vagcat and it shows the pipe as all one section and with the lambda fitting.
I'd really like to avoid paying VW dealer prices and don't really want to end up drilling and welding bits of pipe, so -
can I buy the GSF parts and will they fit
or does anyone know where I can purchase a suitable pipe?
Any help would be greatly appreciated - especially by my neighbours who can't stand the noise!
thanks,
phil