Half the USDM R154's don't have the ABS sensor either... I don't think they've for the flywheel for it either, so if ABS is an issue you could have that problem no matter who you get it from. It is a good point though that no matter where you source it, if you have ABS make sure that the internal flywheel that the ABS sensor reads is present if the donor vehicle didn't have ABS.
Was ABS never an option in Japan for the MKIII? I highly doubt it. If you're judging that off of some that you've seen do keep in mind that ABS was only an option in North America, not standard equipment on any year as far as I remember.
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