DHK 8381-210 Center Differential Set 

DHK 8381-210 isn't fit for 8382 Maximus, only fit for 8381 Optimus, 8384 Zombie 8E

If you want to use this part, your car have to update full set parts as below:

8381-121 ------- 8381-108 Gear-18T (2 pcs)/gear-12T (4 pcs)

8381-122 ------- 8381-102 Diff outdrive/pins (dia 2*10mm)

8381-123 ------- 8381-116 Pinion gear outdrive/pins(dia 2*8mm)

8381-124 ------- 8381-112 Assembly of the pinion gear

8381-125 ------- 8381-100 Assembly of diff gear box

8381-126 ------- 8381-101 Diff set

8381-209 ------- 8381-200 Central diff gear box(complete)

8381-210 ------- 8381-201 Central diff set

8381-737 ------- 8381- 735 A dogbone pin 

8381-736 ------- 8381-708 wheel axle (2pcs)