These are mounts for your Speed Champions models on HSW.

You need two (2) of the “HSW Clip” and one of the holders per model/car. The holders are named by the stud spacing of their baseplate - the common ones being 2x6, 4x6, and some new ones are 4x8.

Print a holder and two clips, then superglue the holder to the clips. Align the bottom edge of the holder for the 4 stud wide holders, and place the 2 stud wide holder roughly 1cm up the clips.

In pictures are also KYZ's Framed Single Wall and Feet for Freestanding Walls