These are substitute bushing parts for use with the Tamiya adjustable suspension mount system. The bushing sprue includes 7 pairs of varying bushing types, each with a unique hole for the suspension shafts, offering 25 potential shaft offset positions, and a range of toe, roll center, and skid angle setups. They are compatible with TRF419, TB-05, and TA07 chassis cars utilizing adjustable suspension mounts.