Sturmtiger, Tiger, Stuka, Panzerwerfer.
Also Ostwind and Piv can work ok, depends if the Guard is standing in green cover / house or not.
Agree atm are Panther in a bad spot at all. ( Su76 Op^^)
Pwerfer/ Tiger does not exist in OKW
I tried using ostwind, and the guards were on NO cover and still managed to lose only a few men in the blob which was frustrating. I also tried walking stuka, but couldn't seem to get a good wipe and they just kept coming back with more vets than my own squads.