If you have 9, you should have 10. Apparently some early ones used 8 triangles and used round on the 2 lower center positions. The top center is a steel conical washer. The brass washers are about 1/4 inch thick on both ends they dont need to be conical. The special nut that goes into them is tapered and will seat in regardless. I would need to check the outer dimension of the brass, those and the nuts could probably be found at mcmaster.com. I used brass nuts on all other positions except the ends. Are you getting another manifold?. If you go with silver-seal, you will get most of the special hardware and they sell the studs.
