buy the alloy from a steel supplier and make them ya self easy peasy:D
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I'll voulenteer lathe time after my move and setup if you can stock in the ally...
also what you have to watch is your overall lift which is not allowed to be more than a 1/3 increase of the normal bumpstop clearance...( you can go more but Im fairly sure you need an engineering jobbie for it)
wether you get that from big ass springs or lifters is irellivant.