2.5" Collector Kit with ALL TWO parts!  
Includes:
1x 2.5" Donut Gasket (This will last a very very long time, not like the crushed steel ones ours is stainless steel mesh made)
1x Male Header / Collector Flange for the Donut gasket with about 1/2" extension pipe to the header side for you to weld on.
Fits all custom Headers with 2 bolt - 2.5" pipings, especially used on B-Series motor in
1994-2001 Acura Integra,
1999-2000 Honda Civic Si DOHC, and Del-Sol with the DOHC motor custom 2.5" collector JDM headers.