I'd bet that redcat have removed the shock mount aka diff mount part becourse it gives a lot more space for mounting the shochs, and there fore you have alot more shocks to chose from, ex. hpi shocks. and normally when you upgrade one arm to alloy you upgrade them both, that's why they come in packages of 2. also the grupscrew in your lower arm stops it from getting any lower, the anjustment of either set grupscrew in each arm is used to adjust the maximum clerance.
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