Hello. I have a 1991 mazda rx-7 convertible and my seats are shot. I want to get these racing seats off of ebay
http://m.ebay.com/itm/321210018048?nav=WATCHING&sbk=1What else do I need. If you could send links that would be great. Thank you

Also how can i still keep the speakers in the headrest working but mounted elsewhere

 

If you look at the pictures in the description it seems like everything is included