You could contact Abogado / Attorney at Law Azucena Bateman Campos. She is located at 16 de Septiembre # 11 Ajijic. 376-766-1654
Azucena speaks English and has done car imports and has broker contacts in Texas and has worked with many expats on legal issues and has a good reputation.
I had worked with Azucena on importing my 2009 Honda Accord and was quoted $2,400 US well over a year ago. I chose not to import and will be buying a new car in Mexico later this year. I also have a 2003 BMW RT1150 ( with expired US plates ) that I will be riding to Texas in May to sell.
Best of luck