The last two posts are right on. Stainless makes rotten screws, no matter where you use them. No weight adbantage and usually softer. Whatever bling there is isn't nearly so important as those two probs.
And I beg to disagree with Chris, perhaps for the first time in recorded history! In theory I think Chris is right -- there should be very little stress on those screws, which is one reason why they're so small. But when there is stress, perhaps landing a triple right on a bump where the bump hits the cover... Also, the effects of dragging on the ground will tend to "screw up" the heads on alu much more easily than steel.
So we use and reccommend steel here.
Try a well stocked Losi dealer -- these are the same as the bottom cover of a xxx-4, and I believe these is a Losi part number for them. Writing from LAX so no time look up the number.
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