What is the fine-grained topic of the following text: They are available for the following GMC Sonoma years: 2004, 2003, 2002, 2001, 2000, 1999, 1998, 1997, 1996, 1995, 1994, 1993, 1992, 1991, 04, 03, 02, 01, 00, 99, 98, 97, 96, 95, 94, 93, 92, 91. Only return the topic.
Availability of GMC Sonoma by year