AFV Club had previously released their suspension sets to upgrade existing kits such as their Sd.Kfz. 250 (with resin roadwheel arm inserts for Tamiya's ancient kits), Stuart light tanks (for Tamiya's ancient kits), and others. This one is taken from their Nashorn kit and not specifically designed for any other kit... The box top has highlighted their box art form their Nashorn kit to illustrate what is covered.
The back of the box serves as the instruction sheet:
Sprue Tree F (of which you get two in the box) which includes the bogies, their articulating mounts and correctly sized road wheels:
Sprue Tree G (of which you get two in the box) that includes the mid production return rollers, bumper mounts, and welded idlers:
Sprue Tree H (of which you get two in the box) for the Pz.Kpfw. III style differential cover and sprocket wheels:
Close up photos prove why it is is WORTHY addition!