I have (1) pair of Ichiba V1 20mm spacers and rings. I have used these for the last 6k miles. There are used and are not in new condition. They do the job and do not vibrate or shake. I kept my extended studs on the car and since I am now running aftermarket wheels I only kept one set.
$50 shipped to the continental US (plus PayPal fees) without extended studs. Touge Factory has some good ones at a great price and I will pick them up for you locally if you need them.
TF 50mm extended wheel studs S14 240sx Z32 14mm knurl | eBay
There are cheaper ones out there as well but I prefer to know I have a quality stud holding my wheels on.
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