You can call Snyder's and get on their list. My brother in law just got his delivered today. They were in stock yesterday but out of stock now. Give them a call.
I'm trying to get a clear answer on this, but asking on the Facebook groups isn't a great place to get info. I've tried and was actually laughed at! I have a '28 Sport Coupe and it has a 2 blade fan. I'm seeing 4 blade and two blade online and I'm wanting to know....which one is correct for my car and which one is the dangerous one.
It's worth investing in a copy of the Model “A” Restoration Guidelines and Judging Standards. They are $20 on the MARC website. This will answer every question of "what should my car have" down to the specific dates of manufacture.