I cut the curb and patched a small dent under the driver's door with Bondo. The spacers didn't do a good job with a little work as Bondo seemed to stick to them and not my car. Instead, I used a small angled metal spatula and just threw them away. I didn't have a lot of money so it's no big deal. However, if you work a little, I think metal is better for applying bondo than plastic.
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