2005 Lotus Elise w/ac stock. Does anyone have any advice on what size/part number serpentine belt I will need to purchase? Don't have access to Napa auto parts, but can pick up from anywhere else. Replacing clutch over the weekend and I am going to go ahead and change belt & thermostat while I'm in there. Also, replacing thermostat. Can I just pick up a thermostat from my local Toyota dealer? Any advice is greatly appreciated.