I've lost count of the replica parts we have seen on ebay for 350 parts, most of which from reports back turn out to be absolute shite and a waste of money.
But not wishing to generalize, sometimes the replicas turn out to be sound and feedback has been a few are considered better than the genuine article.
For me, I would always want to see others experiences with said item, whether that is from a recognized supplier or a copier, before I parted with my hard-earned.
So I would advise about doing an advanced search on here for info, or if that doesn't come up trumps, to then post an ask.