what kind of transmission fluid to use in my 2008 galant
 

I just bought my 2008 galant and it is about the time to replace the fluid in the transmission the car has 60,000 miles on it. should I have it replaced with the mitsubishi brand or is royal purple that is correct for my car a good choice? also any help on any sites that sell anything aftermarket for my car I have been looking for a new grille and lowering kit but I can't seem to find any. thank you!