This listing is for a set of brand new set of guide plates for 5/16" diameter push rods from Elgin Industries that are made in the USA. Set includes eight guide plates to do one pair of heads. These are compatible replacements for small block Ford 289, 302 and 351W Windsor V8 engines with 5/16" diameter push rods. Part Number: GP108S Stud Hole Size: 7/16" Push Rod Slot Size: 5/16" Material: Heat Treated Steel