FS_Spacers should work on any Freckleshack style screen that does not use the PCB for locating the LCD within the shell. Specifically this means Freckleshack or the new backlight kit from China with the touch sensor backlight control.
McWill_Spacers is specially designed to help locate the screen within the shell. The PCB should already do this for you but mine was slightly crooked. This helped, but not as much as I'd like.
The MidWest Embedded kit is located by the cutout you have to make in the bezel.
Please let me know how these work for you. They are slightly undersized due to how they printed on my printer and the actual gaps are about 3.6mm and 6.1mm despite the spacers being 3.5mm and 6mm respectively.