Paul Horton makes a ton of different metal fab stuff from suspension stuff to brackets, etc... A fellow rodder sent the link to me, and I was impressed with their selection and thought I'd pass it on!
http://www.welderseries.com/catalog/index.php?cPath=22
I've used some of his stuff, nice pieces.
I got the LS1 to SBC motor mount adapters, exhaust hanger tabs and grommets from them. DW Horton is great to deal with, a very helpful guy. With the Canadian/US exchange rate, the parts were cheaper than posted on their web site.
Mike
Great resource and useful pics.