Coat Hanger
On my 93, I just made one out of a thick coat hanger. You know, one of those brass colored ones. It was hooked into one of the bed supports. The way I twisted in in there, it was never going to come loose. It was easily strong enough to hold a spinning driveshaft that falls out. It lasted about 5 years, and was still going strong when I traded in the truck. Good, cheap, low maintenance insurance.
simon
PS. I love the prayer/statement at the bottom of that web site.