Classic sells the barrel clips...but IMHO, they are the worst thing to secure your cover. Hog rings will work better. If you are tearing the material, you are probably stretching the cover too much- it's not supposed to be on there very tight...
Go here and watch the 3 videos on padding a seat spring and upholstering a seat spring:
How to recover your bench seat the right way...They also sell a padding kit that is superior to what the other vendors are selling
