Like Migs, I wonder what is the benefit? If you put the caster block screws on your Losi arms, they are as strong as any arms out there.
In general, there are a million arguments in re 4WD front arms, most revolving around much increased stress from driving the wheels and the fact that something has to break -- which part do you choose?
Using the caster block screws on the existing Losi arms gives you many benefits: Good stiff arm is retained; Breakage per race minute is greatly reduced; Parts that do break are less expensive and/or more easily replaced.
IMHO, spending money on parts that sacrifice race performance for longetevity, or trying to fit someone else's part that may or may not retain the fabulous xx-4 geometry makes little sense when compared to the benefits above and the small price of the caster block screws.
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