I tried to find a definitive answer for this question recently, and failed!
I "think" that 5F
should be used to cover all variants whilst the following are full model designators;
-
5F1 ... Hatchback
-
5F5 ... SC (3 door)
-
5F8 ... ST (Estate)
Based on nothing more my car's factory build
sticker and a couple of sites that use these designators.
Examples
here if you look at the selector on the left of the page and
here.