Nikko F10 Rear Shock bodies. Fit Rhino, Bison, Super Lobo II, etc.
If you are missing springs, they are about 60mm Long 14 mm ID 16mm OD. You can find replacement springs this size. Look for other 1/10 shocks. Tamiya Blitzer Beetle rear shocks, or SCX10 / TRX4, are about the right size. You can search AliExpress for springs that are close.
The author marked this model as their own original creation.