Is there an aluminum case posi unit made for the 742?

http://www.1speedway.com/Floater_Rear_Ends.htm

Scroll down til you hit Mod-Lite or Mini Stock, both I have been told can be done up just like a 8 3/4 and the Mod-Lite weighs 76lbs without chunk, when I checked, a Dana 60 is about 150lbs heavier for the housing. I could be wrong though. The Mini stock they said weighed a little heavier but not by much at all. Only downside is the pricing, about the cost of a fully done up Moser 60...for just a housing...

Only thing I have found so far besides Moser's unit which only loses about 15-20lbs or so. But only been looking for a few hours here and there. As far as just the center, haven't found that in aluminum casing yet...I am still looking though.