A Very Angry Gordon's Mini Plarail Haul

No angry gordon?

Its my new rank custom title, Its going to be my nickname on the site from now on.

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Also I have a problem, How do you find that removable cargo pieces for troublesome trucks plarail?

I can't find it, Is there some sort of specific name for it or something?

Because for the empty freight cars i got in my mini haul i need cargo extra for them.

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Like does anybody know if theres a place where I can find removable cargo pieces (flour gravel e.t.c) Because I see like in muddy's videos and like other youtubers train layouts piles of the flour from that one salty set, How do I find it seperately!? please help!