no more fulcrum sleeves since they are made of alloy...
tell me...does the sleeves tend to rust a little over a long period of time?
What's the problem with alloy? They're anodised so they'll stay in good condition pretty much forever without corrosion/oxidation. They're thicker wall than the steel strut tubes that currently hold the car up so strength shouldn't be an issue. As wil8115 says, most aftermarket coil-over kits use alloy sleeves.