Answer by  
                                                                                          sdblack99 (329)
                                                            
                          
                          
                                                           You should probably find a hitch retailer to take a look as you don't specify the exact problem or broken piece. If it is a hard dog hitch or similar (the back one for your Miata to actually tow things) then it probably need replacement or serious repair. You will need a shop that can weld.