I have 3 3/16 Nipple shanks for sale that I bought from rapidswholesale.com. They are brand new and never opened. They retail at 15.39 a piece. I decided to go with elbow shanks and a tower on my bar and these shanks are not needed. Take it off my hands for $45 shipped. $40 if you pick it up. I live on Long Island, NY. Paypal or money order is accepted.
Here is the link to the product:
Assembled Nipple Shanks, 3/16" ID, 3"L: Rapids Wholesale Equipment