Finally got a response today. This from Erika at Beverage Factory
For the item you are asking about "SHANK4-ASC”, it is all stainless steel, the shank and tail piece.
I also asked if it was possible to order just the shank without all the other parts, mine seem all fine, she answered with “We only have the shank with all the other parts included”.
Hope this helps you out. I got a great deal from them about 4 years ago, plated shanks with 525SS perlick’s for a combo price of $25, could not pass it up. So if I have to swap out the shanks for $21 each, I believe that's still is under what the faucet alone was going for.
Tom