There is only an S8-50. The letters after, e.g. F or L or LC are for the S8-50 models which offer various extra options or enhancements. There are 6 different motherboards available in the S8 50 range for example but only the 1 LCD / touchscreen module
Here is a link to the service manual for a Lenovo S8 50 tablet.
It shows how to dis-assemble the tablet.
It also shows that the LCD screen and the Touchscreen are one complete module.
Here is the part number for the module - 5D69A6N2YU. (Item #4 p.38 of the manual)
Searching online, using just this number in the search box only, (see image below) will give results of suppliers of the part.
It is not cheap to buy!
(click on image to enlarge for better viewing)
Hopefully this is of some help.