Can you please advise me which tow bar is compatible for a Mazda 6 2006 luxury

"Which tow bar" -- I'm sorry, I'm not understanding? If you're towing the vehicle behind an RV, consult a local shop that specializes in this kind of activity. If you're looking for a trailer hitch, again, seek the guidance of a local shop that may be able to fit the vehicle accordingly, along with providing you with information on towing limitations.