Yeh, I found the same clips from Carter's that you are refering to and ordered two packs of them. I talked to a local guy who does upholstery on classic trucks and he recommended the "C" clips due to the style of frame my seat has. Because the bottom edge of the frame is solid, there is no place to attach hog rings without them showing along the bottom front edge. My old upholstery which is original (I'm fairly sure) was attached with the "C" clips, but those clips were rusted out and not reliable for the new covering. Even if the new upholstery stretched far enough to go back under the seat, the only place I see where you could attach hog rings and have them not show would be directly to the spings and I would think that would cause the springs to be slanted due to the tension, so I don't want to go there even if I could. The upholstery isn't that long to where it could be fitted up underneath without compressing the springs. Guess they made those "C" clips for a reason and certainly makes sense to me.
