Changing Driveshafts...

[Digsey]

Just about to change my N/S driveshaft, ive got new oil and washer etc for the gearbox, but ive just opened the driveshaft up and noticed its been supplied with a nylock nut (see picture) instead of the "ENKO" style nut.
Is this new nut okay to use? Ive read you're not supposed to reuse the old one, but i cant find ENKO ones online?

any help is appreciated

 

[Digsey]

Forgot the picture on the new supplied nut... sorry