I too came across a Falcon freewheel years back and the the Park one worked fine. I wasn't aware there are possibly many Falcon sizes, so I assume I got lucky.
In the past, I emailed Park directly for advice and received responses within a few hours. They have great technical support. I suppose you can send them a pic of the freewheel, maybe include a pic of a caliper across some easy to measure features, and they can recommend a product.
Last edited by MudPie; 09-04-22 at 10:33 PM.