Is my FMS M-4602-G Driveshaft Authentic?

Bought this from a reputable company. It came in a genuine FMS box, but the production sticker on the driveshaft reads "Neapco Drivelines" and a p/n of CM 4602-G. I did some googling on that info and couldn't come up with anything other than Neapco is an aftermarket supplier of driveline components. Could I have gotten the 'switcheroo' or does FMS use Neapco as their shaft manufacturer?

Thanks.