Has anyone ever seen these in SS 1/2 and 3/8?

http://www.thehotrodcompany.com/shopnow/show_item.asp?product_id=7%2D0519

Or maybe I have to get 1/2 and 1/2 and figure out a way to put something in there to make the 3/8 snug.

You could get a single for the 1/2" line, and a single for the 3/8" line, and use the same bolt to secure them similar to how the double 1/2 one is. Have to think outside the box :D.

Yes I did see a post where a guy welded them together but I rather avoid that with SS

Yes I might end up doing that... I used to use the rubber coated clamps but that was with an elec pump which I don't use anymore but it might be good planning incase my racepump turns out to be a flop. SS on SS attached to frame would probably vibrate like crazy if I have to switch back to elec. I'm just a SS kick I guess

I used the insulated clamps, using the same attaching hole for 2 clamps. This is -6 Russell line:
http://i168.photobucket.com/albums/u165/Bowtie-Bry/TECH/DSC03273.jpg