I had the ichiba 15mm bolt on spacers in the rear and they were crap. One of the studs broke off after just a couple of weeks, then a few weeks later the spacer actually cracked and broke into 2 pieces.. luckily i had to take the wheel off and noticed.
I've switched to Z1 stud replacement since and so far so good, they look like better quality then the ichibas and the stud replacements give you more peace of mind.
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