The 10AN ORB with 5/8" Barb to 10AN Male Bulkhead Fitting was introduced in Radium High Volume Fuel Surge Tanks in 2015. It includes a preassembled FKM O-ring and requires a 10AN ORB (7/8-14 threaded hole) with SAE chamfer to be drilled into the mating part for sealing.
These are the same machined aluminum injector seats used in Radium fuel rails. They are required when converting an aftermarket injector that uses a 14mm lower O-ring.