Alright guys, The spacers listed by optionselect on ebay are VERY good pieces. I bought the 25 mm, all 4 for 150 no S&H.....They are 2 piece hubcentric made of the same alloy as the others you're talking about. I (me personally) mounted them on a set of 19" wheels and they actually were as good or better in RFV and balance(Measured by a factory Kokusai tire machine) as the wheels without the spacers mounted. There should be no vibration if you mount them properly.
Of course with all ebay purchases you roll the dice, but these pieces from this vendor were excellent.
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