Yep, same thing happened to me too, should have know better to buying cheap non genuine made in china stuff. But I thought I would give them a chance on a part that is either hard to find or bloody expensive ome.
But you know when I do get ome parts, I also get all the other nuts, bolts and washers too, sure I have to pay for them but at least there in there.
You will also find a lot of these non genuine parts, are not great fitting.
If you want to be a cheap skate and get cheap stuff, don't expect it to be what you want it to be.
Watch out for the non genuine brake shoe springs, they dot fit, or not with ease.
And forget Brit part stuff it's a joke......