The ARP Moroso carb stud kit (part referenced 64927) is described as a stainless-steel carburetor stud set for Moroso dual return spring configurations and includes a 1-inch spacer plate per the listing. The overview frames the kit as the 64927 variant intended for installations that require the spacer. The product description specifies the included 1in spacer plate.
ARP Moroso 64927 Dual Return Spring w/ 1in Spacer Plate SS Carb Stud Kit