OK, I found it: from Model A News, Vol 62, No 1, Page 60:
Model "A" Suspenders.
Blue with white letters. Black with yellow letters, or white with blue letters. $20 each or 2 pairs for $38 plus $5 shipping. Send check to Gene Bertani, 6334 Payne, Dearborn, MI 48126. 313-581-4984.