A few years ago i bought hundreds of hd280s broken, repaired them and sold them. I found these parts in my audio junk bucket as leftover, figured someone can use to repair theirs.

headband, two (L and R marked) driver case hinge covers, and PCBs are in good shape. The one foam earpad as u can see is super moldy, and the two driver outer housings have each one busted hinge, but they do work once the hinge cover gets installed. One inner driver housing isnt great but usable.

Just pay for shipping and you can have these.