mislead about late model master cylinders???

http://www.partsamerica.com/ProductDetail.aspx?mfrcode=TRQ&mfrpartnumber=M99294&parttype=230&ptset=A

this is the MC i got, except I got it as a "brakebest" from Oreilly

this is the only pic i could find....

also, i learned just now that they didn't have 1 1/32 MCs in aluminum as OEM equipment....

should I go buy a reman aluminum unit??
I know this iron one is definitely an upgrade from the original, but maybe the aluminum will be even better
I found reman ones in manual or power....which do i need??