use OpenIV
go to Grand Theft Auto V\mods\update\x64\dlcpacks\bencongt13\dlc.rpf\x64\vehicles.rpf
open bencongt13.ytd and click on the plus (+) icon
navigate to the folder with bencongt13_sign_2\bencongt13_sign_3
select both and add them
save
done!

ive put these liveries as optional because some of you may find them a bit unfitting for a luxury car while others would really enjoy them
youve got Cipher to thank for them!