From their announcement:
The Ratgard IFV Hull Extra Armor Upgrade Set comes with 12 pieces of resin parts. Including 2 pieces of side armor, 3 pieces of Front Armor, 6 pieces of Exhaust and 1 Driver Hatch for the Imperial Guard Chimera IFV. This set is 10$, shipping to the worldwide, you can contact me with suvietrat@gmail.com.