Fwiw, this is a euro cluster. I've searched every post in the archive, and it seems that byte 65 works on NA clusters, but there's no answer on how to get Abarth graphics changed on an EU cluster?
Yani came through big time with an out of the box solution that worked perfectly. Had to do a non standard workaround, but I've now got the Abarth graphics on the cluster. Sweet.