Can't find right collector seal for Rams Horn

[mattfranklin]

I remember seeing that the passenger side has a half doughnut into the manifold. Driver's side was a full doughnut. (I used two driver's side manifolds on mine so I could use a full doughnut on both sides.)

EDIT: I posted the details on this site...
https://67-72chevytrucks.com/vboard/...d.php?t=846677
Not exactly what you're doing, sometimes seeing a family of parts and part numbers will lead you to the right area for yours.