I made these grillblocks out of a rolled black plastic I bought for the now abandoned full undertray project. (I postponed the undertray mostly because I could not resolve fluid leaks at first, then I lost the resolve for a complete undertray.) These new ones are more durable, better looking (!), and more effective.
The material won't fade in the sun, like the old aluminum upper block and coroplast lower block did. And because they are made of the same stuff as my wheel well skirts, they offer a little consistency of materials on this eco-ratrod. Lastly, the lower grillblock is more complete than the older one. And in this coming winter I will be able to move the license plate to cover the remaining hole.
Upper:
Lower:
On the car:
