Hello,   The plastic shroud should be part number 2GYPJ. As for the case cover, I'm showing HG685.   I'm not sure where you might be able to find these parts, but hopefully this helps. Let me know if there's anything else you need.
So i just bought a cheap r220, but it came without the CPU fan shroud thingy and no top cover/lid. Is it possible to get the part number on these parts so that i can try to buy new ones? cant seem to find a store that sells them when i google, ebay had the shroud....for a while but now that seems to be gone aswell 
r220 spare parts