For you guys on the Eastern side of the pond, I found a reference in thingiverse for a filament that looks good.
https://www.thingiverse.com/thing:3308068
It's 3dk.berlin Dahlia yellow filament and looks to be a good match for Bruder yellow.
I've contacted them about USA sellers, and/or cost for shipping to the Western side of the pond - I'll let you know what I find out.
Don