Yeah, I ended up using that yellow for the shoulders and knees. I think it worked well enough:
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The lighter yellow is Rust-Oleum Lemongrass, which I still have some of. I might use some of that for the yellow on the chest pieces, but am currently undecided. Not sure if I could "mix" them while spraying to get kind of a lighter shade. The Line Striping Yellow is probably close enough, however.