Due to a change in v0.55 version of the mod, the couple of Ginetta skins was updated (in order to match the new aerocatches and Ginetta badge). You can download them again at the same links.
Another skin for the Ginetta G55 mod in Assetto Corsa.
A skin for the new Ginetta G55 mod in Assetto Corsa.
If you want to play “spot the difference”, there are a few pictures on Tolman Motorsport’s site: http://www.tolmanmotorsport.co.uk/index.php/tolman-motorsport-racing/tolman-motorsport-race-gallery/64-ginetta-gt4-supercup-silverstone
Another link, if you are curious to see the original design by Chris Warner: https://www.behance.net/gallery/19266131/Ginetta-G55-GT4-Supercup