(Pair) .100" Needle Seat Assembly With Reusable Nylon & Stock Gaskets , Fits: Holley Carburetor Specs: *Sold As a Pair *High Flow .097" Seat Opening Size *Viton-Tipped Needle For Use With Gasoline, Gasoline With Ethanol, Racing Fuel (110, 112, 116, etc) *Includes a High Quality Reusable Nylon Gaskets & Factory Style Fiber Gaskets *Fits: 2300, 4150, 4160 & 4500 Series Holley Carburetors and More !! *Part Number: 6-506 *These are Genuine Holley Performance Parts *These Parts Will Come In Bulk Style Bag Packaging *** Holley now sends me size .100" for the .097" we order because they are so close in size and its easier to inventory just the one size. These work exactly the same and the size difference has no effect on the way the carburetor performs. Holley has sent them this way ever since they bought Quick Fuel****