Radio Shack will have the eye connector you're looking for. It might cost you near $2, cause they might make you buy a package of them. I say go for it.
I've never seen one of those plate things before. My Contour came with three little eye connectors that attach to the negative cable, & I've had no problems with them yet. They seem to be corroding just a bit, so I may have to replace the connectors down the road a year or so.
