hey tucker ya kinda figured the 1 was 1 of that part number...

what i did find confusing was the 2 different part numbers and also the types

so like you said it does seem the 28 servo motors work on the 21's i am thinking of getting the one i found and disregarding the type hopefully the different types dont have any differences at all

but thanks for clearing things up for me

input on the types would be great