Hi, 200121 is the factory's production serial number, i can only sure AKM 170629 01002 AAD 3620A H is AKM-100SXH 20inch motor.
It seems that the code of the front and the rear motor is different.
The AKM-100SXH rear motor 26inch i have code is :BBC3626A-H, AKM-100SXH front motor 16inch code is...