Lurraldebus (Gipuzkoa, Basque Countrys public transport) Mercedes Citaro.
Replace the 4 bus files here:
mods/x64e.rpf/levels/gta5 and enjoy!
Optional: you can add VEHICLE_HAS_LIVERY flag in vehicles meta to allow multi livery on the bus.
Credits:
Model: Squir3d
Polygon optimization, conversion to GTA V, template and livery by: mmods.