These can be found on many of the fastest Track and AutoX cars in the country.
These uprights help correct geometry from lowering the vehicles, and allow for bump steer correction. The 2" drop version is designed for race vehicles lowered on a 25.3" tire, while the 1.25" drop is designed for a more street friendly ride height.
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12/24 Availability Update: I have 2 sets of 1.25 (32mm) version, and material on the way to make more 2" (50mm).