These are the new heavy duty pivot balls. The threads have been increased to 6-32. The redesigned cone shape from the collar to the ball increases the strength as well. This pivot ball set has collars in a shorter location which allows you to adjust the roll center height. Using various spacers, you can adjust the from a high roll center all the way to the lowest. We sell some spacers here.

For the Dart 1.0, you will need to drill out your Float Bridge with a 9/64" drill bit to accomodate the larger 6-32 threads. (The Dart 2.0/2.5 car already has the larger holes in the float bridge.)

Sold in pairs.