Normal Limbs only come in One Specific Color and you can not change its color.
Hypercamo Limbs are just like Normal Limbs but you can change and customize their color.

Experimental Limbs look more realistic, they no longer have bot-like features, they only come in One Specific Color and you can not change its color. (If you have seen or used Seamless Parts Mod, They look just like Seamless Parts but a little worse visually)

Hypercamo Experimental Limbs can change and customize its color.

Prosthetic Limbs can not be bought and the only way that to get them is by completing VolksAuto Contracts.

All of the Bot Parts randomly appear in the Shop. It depends on your luck.