Precision made aluminum step stud to convert 8mm x 1.25 thread pitch hole to 6mm x 1.00 stud. These are made specifically for adapting the delrin intake manifolds to the cylinder heads with 8mm holes. Many times the hardware store variety step studs have an unthreaded 8mm section which prevents them from being fully inserted. These are sold each, 6 are required to install a pair of manifolds.
These studs are available by special order only. Please read store policies regarding special order parts and allow a typical 2 to 4 weeks for delivery.