380 mm x 520 mm x 140 mm IKO NA 4976 needle roller bearings

380 mm x 520 mm x 140 mm IKO NA 4976 needle roller bearings Deal is your LYC BEARING CORP.OF German LTD. source for OEM 380x520x140 bearing and accessories. We sell Genuine380x520x140 bearing at 380 mm x 520 mm x 140 mm discount prices. 92.1 mm B1

What is NA 4976 bearing interchange？