Derale 34550 2 1/2' Universal Fan Spacer: Automotive. Buy Derale 34550 2 1/2" Universal Fan Spacer: Fans - ✓ FREE DELIVERY possible on eligible purchases. Aluminum construction . Anodized clear finish . 2-1/2 inch length with universal 5/8 inch and 3/4 inch female pilot . Fine and course 5/16 inch thread hardware included . This universal / inch belt driven fan spacer comes with a clear anodized finish and is designed to fit most domestic 5/8 inch or 3/ inch pilot water pumps. . . .