Crossover pipe gaskets/donuts?

[saburai]

Hi Gang!
Are there any gaskets on the Y collector and crossover pipe?
When I disassembled the factory exhaust system, there were some flat conical rings between the exhaust pipes and the manifolds. The ATS documents don't mention anything and me and the counter guy at NAPA didn't find anything listed for a 90 F-250 diesel..

 

[Tristan]

Nope, not sure what you had on there. Should just seal up with the cone shape.

 

[saburai]

That's what I assumed, but I thought I'd ask the gurus