Dyna Glide ModelsSuper Glide, Super Glide Sport, Super Glide Custom, Dyna Glide Convertible, Super Glide T-Sport, Dyna Glide Police, Dyna Switchback, Low Rider, Street Bob, Fat Bob and Wide Glide.
I saw a bike once with 72mm forks. Looked like feakin tree trunks.
I just looked at Progressive's web site and their replacement fork springs. The sizes they list for all Harley models are 39mm, 41mm, and 49mm. So based on that it looks like the FLs have 49mm forks also.