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 #9029-163 and #9029-164 for all Circle Track shocks except 70 and 82 series.
Part #9029-165 and #9029-166 for 75 Series.