You do NOT want NOS you want NEW, buy it from Partzilla or your local Yamaha dealer.
Fortunately Yamaha IS still having this part made so we can buy brand new OEM parts, how great is that? You don't want NOS because the rubber age hardens and gets brittle, the rubber bond to the aluminum bracket tends to fail with age also. Who wants that? Pretty much every OEM front guide in the world was sold in a big panic about two years ago, then Yamaha got new ones back into the system so you are about guaranteed fresh stock. Plus whatever, avoid the MikesXS guides they are not as good as the genuine Yamaha parts.