Something I found in a 1979 Car Craft magazine - quote " Recognizing the potential of the arrow/colt and sapporo/challenger models as racing machines, Chrysler Corp has just released a comprehensive 26 page catalog of goodies designed to help turn one of the little cars into a semi- or -all out road racing or Pro Rally car. Available by mail for $2 , it lists engine pieces, trick transmissions, and special rearend housings complete with limited slip 4.22 or 4.62 gearing."
It wasn't the same but at least Chrysler was trying ! By the way the same issue had Don Prudohme flogging an Arrow GT around the Willow springs road race course, he had a lot of complimetary things to say about it.