Round Knurled Valve Stem Nuts for Brass "Ts" and other early cars:
Also available in Stainless Steel (looks like nickel) For metal valve stems. $20.00 for a set of 4, add $1.50 shipping
Staybrite Clear coating for polished brass. Best I've found! 12 oz Spray Can. $12.00 Plus $5.25 Shipping