The production figures suggest that there were 523 MG-TFs but 0 MG-fs were exported to Mexico, the MG-F and TF use the same windscreen. So perhaps if you were to search locally for a MG-TF windscreen, The local suppliers probably won't have a listing for the MG-F but may have a listing for a MG-TF.
Make sure that the supplier understands that the MG-TF you're talking about is the one built from 2001 not the one built in the 1950s.
Good point, I forgot about that.And do also search for 'Rover' as manufacturer and 'MG-TF' as model.