The 324's rule! They have a very nice finish too.
Go to a bike shop and ask for a pair of the plastic demo inserts that come on new bikes.
They clip into an SPD pedal on one side so that customers can test ride bikes without having to wear bike shoes.
You may be able to get them for free as they usually removed at the customers request and thrown away after the bike is sold.
They are very rugged and last a long time.