Just buy 5 litres of 10w 40 synthetic, you'll have a little bit left over. Something like Shell Helix for a good quality medium priced very good value oil. Fuch titan pro S if your feeling the love.
Door trims at the bottom are the same excluding the RS2 and S2 of course,they're different.
Thermostat,isn't a temp switch it's just a thermostat.If your looking for a part number look for the part that looks like a thermostat.