'88 560sl Exhaust manifold question

[RandyA]

My '88 560sl has a broken bolt at the Right side exhaust manifold to exhaust pipe connection. The remaining bolt is loose and probably seized. Repair looks like it will require removal of the rear half of the manifold to be able to get the old rivet nuts out.
Does anyone know it there is a gasket in the union between the exhaust manifold and the down-pipe?
My manual (page 49/100) does not show one. I can't believe that the Benz engineers missed an opportunity to add a gasket, washer, or bushing.
For once I'd like to have ALL the parts on hand before I take it apart.

Thanks.