The mugen arms you show in that pic are upside down btw. Not a biggie it wont really matter.
I used to put mbx 6 arms on my mbx5 so you should actually be able to use mbx6 arms if you want, they are easier to get and have thicker plastic up front on the hinge pin than the mbx5 arms.
You should like the 1900 motor it will stay much cooler. (I race with that motor) If the gear ratio on that caster is like its counter part mugens 13-16T pinions should be your range.
Be sure on the booties they are a tight seal. Its only as good as the seal otherwise any dirt that gets in is destine to be tossed around in there till its ground up into dust wearing your joints even more. Are you guys oil/greasing your cva joints or running them dry with or without the boots?
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