I need to some help here am doing the frt and rear differential oil change the transfer case service, I just pick up the washers at the dealership and all am seeing is 3 crush washer(12157-10010) 1 big brass washer (90430-24003) 2 regular washers (90430-18008) . Does all of the washers has to be crush washers? the part numbers are correct but i don't know if the parts is correct since its in open packages with manual written part numbers. Can some let me know if this is correct. thanks in advance.