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You can get springs anywhere that deals in upholstery. Once you take the cover and plywood off you will see where the spring are supposed to clip into. Messure the distance across and multiply by 5 for each seat. Add a few inches to that measurement. The spring comes on a coil so you will need a length to tell them for how much you need.

The sport buckets will give support keeping you from sliding around on turns and such, are significantantly more desirable and easier to get covers for.