Whilst I appreciate there is a bodyshell list, the reality is that there are three shells that work on the track. Most popular is the Protoform AMR12, which works well everywhere, especially in Modified. Next up is the Black Art/CRC Bomb'r. This has more steering, and is favoured by some drivers and useful in Spec class. Least popular is the Parma EE1, which tends to give more mid-corner rotation at the expense of turn in and exit speed.
Most people would choose the AMR12 for both classes. HTH