400 mm x 540 mm x 27 mm KOYO 29280 thrust roller bearings

Various thrust roller bearings B00308 Product Group types and sizes to accommodate your BEARING CORP. LTD. 400 mm x 540 mm x 27 mm KOYO 29280 thrust roller bearings 400 mm x 540 mm x 27 mm requirements.

What is 29280 bearing cross reference？