My first thought after i started to paint Mclaren M23 skin was, oh no this is going to be hard to make, but after few hours of work it's ready.
Package contain Mclaren M23 livery, Emerson Fittipaldi's 1975 helmet, suit, gloves and face etc. Package contains also smaller helmet and front/rear wing textures.
Install Mclaren_M23 folder to ..steamapps/common/assettocorsa/cars/ferrari_312t/skins folder.
Install smaller_textures folder files to ..steamapps/common/assettocorsa/cars/ferrari_312t/skins/Mclaren_M23 folder.
Big thanks to ML2166 for template.