Why eight washers in windage tray install kit P3690939?

I did not find any large washers anywhere when I disassembled the 340 ( 0.40 over) with factory windage tray that I purchased. If they go under the main cap bolts, I don't believe the factory motors had any washers on the bolts and I don't want to limit thread reach by using washers not needed either. ??

Mopar Performance P3690939