They are plastic. You can use either one, really doesn't matter. I don't run one at all, they are basically pointless.
My 4Runner didn't have the engine cover in place when I got it.
Is it supposed to be the black version or silver one?
And are these metal or plastic?
VVTI engines will have VVT-i on the cover. The 2 covers the OP posted are for non-VVTi engines. My 2003 is non-VVTi and came with the silver cover originally.I have the silver one (VVTI 2UZ). A quick search online shows the sliver one on VVTI and non VVTI models. They also need a pair of brackets that sit on the manifold.
I think it looks pretty good without the cover. Just IMO.
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Glad you posted this .... I see I'm also missing a cover over the radiator. lol