Futaba and Savox both use 25 splines so any horn that's listed as being able to fit a futaba servo will also fit a savox, I use the fastrax alloy short arm in my b4.1 and have had no problems whatsoever with it I got mine from apex models and if you want I'll stick up a link later on (the works net nanny wont let me onto retail sites for some reason)
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Hobao H2 Pro
Team Associated B4.1 FT
Ko Propo
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