If you have a Prusa Mk3 with the multi-material upgrade 2.0, then bring LCD 1 and LCD 2 into Slic3r and print the two objects together, if done correctly the holes for the letters should line up with the letters. Print LCD 1 in PETG Prusa orange and print LCD 2 in PETG black or any other color other than orange. Also, print the Prusa frame add-on in PETG Prusa orange. If you do not have multi-material upgrade 2.0 print everything apart and glue them together. Either way, print the Prusa frame logo in PLA(same color ar LCD 2) and glue that to the frame in the top left where the holds are. You can also tape the addons for a non-permanent solution. 
Happy Printing!