Gentleman Jack.. He's on the forum was introducing NEW aluminum h-riser castings. Because they use a different stand than the standard or MR/TP heads and relatively scarce I would imagine he offers them. I have his number somewhere. I will PM you if I can find it.
I thought POP was offering an aluminum version as well. You might try DSC motorsports. Dennis also may be an avenue for stands.
My apologies for being slightly off topic.
