Score some rare market treasure here. In fitment as well as flow, BBM's 6AN rail is a proven solution for discerning builders who "know".
This piece is a direct bolt on to factory KR, PL, and 9A 16v heads with the factory intake or Euro 50mm manifold. (The ABF variant differs and is not compatible with this piece.) Precision CNC crafted from 6061-T6, billet clamps and hardware are included. Finish is a subdued natural billet satin.
Note: This rail features exensions for each cylinder that reach down between the intake runners to attach to the injectors. These points are sealed with a special o-ring set found here. They don't wear out, but if you lose them, the replacements are ready for action.
Of course, CIS bits are shaped differently than electronic fuel injectors. So, these Billet Injector Cups are likely your next interest.