It's common with 60$ carriers sometimes...
If all the right pieces are there, then I'd ask someone to measure their carrier.
Lots of Ebay stuff under the ad will say "Fits XXXXXXXXXX" but that is often very incorrect.
Can't be hard to figure out unless you already tossed your old carrier. If your chain and rotor line up without play between them I can't see it being the carrier. If the play is in between them and they are both lined up and on center, it's the carrier.
You may be able to use it with some custom made collars, won't hurt anything if done right.
All our government does is distract us while they steal from us, misspend our tax $ and ruin our country