Hi all...I took Doc's recommendation of J-Corder for those studer style aluminium caps and asked if they just had the black "hockey puck" Revox/Studer NAB adaptors. Jeff told me that they do, even though the adaptors aren't listed in their catalogue (
http://www.j-corder.com/).
Anyhow, if your looking for the plastic Studer NAB Adaptators and are tired of bidding on them, contact Jeff at J-Corder. They're going for $95/pair or $85/pair for 5 pairs or more...I ordered 2-pair and they arrived within a few days. Darkfield is on the bottom and their brand-new black plastic...also a bit tighter then my old ones.