Windage Tray Installation?

The Mopar windage tray kit I got for my small block came with hardened washers and the bolts that came with it are the same length as the stock bolts. So, why does it come with hardened washers? What are they used for? They can only be used on the main bearing cap bolts, not the screws to hold the tray on.

I saw somewhere to put LockTite on the screws for the tray. Which LockTite, and do you put it on the threads or the screw head/tray junction only?

bwhitejr