Stud Ext Alum 1/2-20 Unf 2.000" Lg W/ Seat. QA1's Aluminum Shock Extensions can give you a little more length if needed for your application. With 1 or 2 inch lengths and 9/16 or 1/2 inch thread sizes, you are sure to find one that will fit your needs. Part #9029-166 for 75 Series.