If you want to make these skins work with "audi_r8_lhm" mod, you should
change the name of these two files "r8_gts_body_dif" and "r8_gts_body_map" as
"r8_lhm_body_d" and "r8_lhm_body_m" for each skin. (tire and windows files too, if necessary..)
There are a few R8 mods too, you may succses to make these skins work with them by changing names of .dds files accordingly..