Most two-wheel drive leveling spacers are made from polyurethane or UHMW. I was checking out ebay recently and came across a kit where the spacers were made from billet aluminum.



FORD F250 F350 SUPER DUTY 2WD 2" LEVELING LIFT KIT FB2 : eBay Motors (item 110488105005 end time Mar-01-10 08:17:44 PST)

Pretty shnazzy!

Stewart