Spoke with Ames. They pulled the product and examined. No luck. (BTW - FT210F has a photo of trim rings that look like mine... but in reality, they are quite different - the valve stem has a hole instead of a slot)
Still searching...
1968 Firebird 400 Convertible Original: Engine, Intake manifold, Heads, Body, Stereo, 3.08. THM400. Engine rebuilt by Ken Keefer early 2012. New: Holley 4bbl 670 HP, hidden iPod setup, RobbMC mini starter, A/C, front disc brakes