For sale is a set of three Bridgeport N-2 (N2) collets: 1/16, 1/8, and 3/16. I believe that they fir the QRA attachment, but any application is your responsibility and ultimately I do not know what they fit exactly.
The collets have some minor rust on them. If you do not like this item for any reason, within 7 days of receipt, you can return it to me for a refund of your winning bid. You will have to pay shipping both ways and pack carefully.