These are V2 models which have the following updates from the original design:

The M502 uses eyelets and no PHR

Bar bore: 35mm

Case width: 68mm

Spindle Size (Diameter): 30mm

Enduro 6806 29mm x 42mm x 7mm Bottom Bracket Bearing - 29mm - 42mm - 7mm - ABEC-3 Radial Bearing - C3 Dangerous Goods These are V2 models whichEnduro 6806 29 LLB ABEC 3 Radial Bearing (C3 Clearance) 29 x 42 x 7mm ABEC 3 Radial Bottom Bracket bearing featuring 52100 High Carbon Chromium alloy races paired with grade 10 Balls with 90% fill, high pressure, water proof grease. The most common use for this bearing is as a direct replacement bearing for BB30 and PF30 type BBs and SRAM DUB cranksets. Enduro Item Code: BB 6806 29 LLB bag