Peterbilt 389 Modified v2.1

changelog v2.1 from 18.04.18:
Adapted for 1.31
Small optimized

changelog v2.1:
fixed truck width and all needed parts ( fender, bumper, mudflap hanger)
rearranged all headlight models
added new 389 style headlights
added few headlight accessories
added new fender bars/blinker bars
added new steps (379 classic style, 389 style with dpf box)
added new mirrors ( door mounted 379 style)
added external 379 style interior
added round door window when select 379 style interior
changed the truck paint material and all painted parts
added new bumpers
added new LED lights
fixed the cab models ( fixed normals, removed double vertics, done proper edge spliting)
changed front bumper variants
added paint window trim
added new type of antennas (now selectable)
added new variants of DEF tank combo (painted and short variant)
added steps as tank accessory
rewritten all addon hookups ( should now don't conflict with other mods)
added new exhausts
added light slots to some sun visors
added new cabin racks (models by bansheewoj)
added new deeper sidebar
added retro roof wing for daycabs and flattop sleeper
added support for heavy haul dlc front banner and flags
updated engine sounds with new ones from kriechbaum
updated engines with torque curves
took out the classic engines ( will be a separate addon mod, to remove the clutter in the engine selection of the main truck)
fixed some engine specs
fixed some bugs
added some new bugs