I've never seen one with an aluminum housing. Proform makes a new plastic one for about $220 (Jegs sells it). I would really recommend a refurb from a local parts store. They will come with a Lifetime Warr and you won't have to rely on some guy in Cali to get a warr taken care of. Go with AC Delco cap and rotor.
AC Delco Cap:
http://www.oreillyauto.com/EW3/Produ...¤tPage=0
AC Delco Rotor:
http://www.oreillyauto.com/EW3/Produ...¤tPage=0
Cardon Reman Dist w/ Cam PS:
http://www.oreillyauto.com/EW3/Produ...¤tPage=0
Just a FYI there really is no performance gain with these dist. Its not like the older styles where points, weights and ignition modules could enhance the opertion of the ignition system.
Here is the Proform Dist @ Jegs:
http://www.jegs.com/i/Proform/778/67026/10002/-1
I don't know much about it, but if I need a dist again I will probably go new from Oreillys or NAPA.