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If those are the parts you need, they are both current part numbers.
You can order them through any Generac dealer.
Click here for more information.
Since you had listed some part numbers, I assumed you had looked at a parts diagram to verify which part you needed.
I really don't know which part you have broken. I can not see what you have.
First you said you needed a "exhaust manifold pipe", then you said you need the exhaust manifold.
The manifold is the 0F8256.
What I would personally consider the manifold pipe the flex pipe, part number 0F6528.
We can not see or hear what is going on. We only know as much - or as little - as you tell us.