ebay MOPAR SUPER SIX SLANT 6 26 PIECE INTAKE EXHAUST MANIFOLD WASHERS & NUTS | eBay
There are aftermarket triangle/D washers available. That's what came with my manifold from Silver-Seal (Dorman). However they are not shaped the same , just flat cutouts. I sold that set to somebody that said they were perfect for a convertible top install (?)
