I was looking through Summits site and found a few dual fan setups for bigger trucks and such. They used aluminum blades and a believe an aluminum shroud as well. These were 28.5" wide whereas the FAL's that are a direct bolt in to our cars are 26" wide. I'm not sure how well you are at customizing stuff but you could probably make your own mounts to adapt these fans to fit into a DSM... I think its very possible with a little do it yourself engineering.
http://store.summitracing.com/partde...5&autoview=sku