Hi, I am fed up with my cruddy sound system in my 51 pate 307, from what i can make out one of the front door speakers are loose as this rattles lol, but what i wanted to know was what type and spec speakers would i need for my car, i cannot afford to replace the head unit but i was thinking it would sound better with different speakers. these would also have to be a direct replacement as i dont wish to mod my car so a straight swap is whats required. So what size, Wattage, brand ect would i need? Regards Robert