Please see Carroll Smith's Nuts, bolts, fastners, and plumbing handbook. The link below will take you to the index. There is a nice picture of a suspension saftey wired on page 123. I'd also highly recommend picking up the book as a refrence.
http://books.google.com/books?id=A81HmmRCN7YC&pg=PA222&source=gbs_toc_r&cad=4#v=onepage&q&f=false