Hmmm. Everywhere I have looked suggests that there is no difference between the standard and ABS models throughout the range.
Except in 2008 and 2009, the rear brake master cylinder is listed as a 43510-MCS-R01 instead of a 43510-MCS-G01 or G02 for all other models - including the USA 2012 model and the Uk 2014 model.
In the Uk the R01 is showing as back order, no stock. Which means they have to get it from europe or Japan.
Will the G01/G02 version fit ? I don't know. Generally, R01 rather than G01 seems to be more than a minor update. Eg The parts are not compatible between the two, although they may both fit on the same bike if all of the changed parts are fitted.
If the changes to the front braking system in 2008 are indicative, the entire front braking system with the new R01 code will physically fit on the older bikes. Wheels are the same, fork legs are the same. But none of the parts with the R0x revision code are compatible with the G0x parts. Eg the pads are not interchangeable, neither is the brake lever. But with this, there are other issues - the right hand bracket supports a different sensor and the pulsar ring is different, as it the ECU. I'm just saying that it would physically fit.
I checked out the 'Step' - the large silver footrest bracket - onto which the rear master cylinder is mounted. They are the same, so the G01/G02 Master Cylinder will physically mount in the same place. You would need to check the part numbers for anything that connects with the MC - eg brake lines and the reservoir mount and hoses, brake pedal linkage. It would make sense to check your 2008 model against the USA 2012 model which also uses the G02 MC. The Step on the 2008 model is the same as the 2012, but it is different from the Pre-2008 models (The pre 2008 models do not have the rubber grummet to support the plastic side infills.)
It might turn out to be not such a big difference.
When I changed my radiator, there were two versions, one was £100 cheaper than the other. Fortunately David Silver informed me that mine was the cheaper version. Afterwards, I checked the part numbers for everything that came into contact with it. The frame, the hoses, the fan, the cables, the bolts. Everything was identical. Except the radiator cap. The old radiator cap would not fit the new radiator.
You may find that the only parts that are different are all included in the MC sub assembly.
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nb the change in rear master cylinder cannot be to do with the change at the front caliper as the USA 2002 model and the UK 2014 model both reverted back to using the G02 master cylinder - yet they retain the new style front calipers. I don't think the rear calipers have ever changed.