The factory carrier bearing bolts (R) have a free-spinning washer. I could have used these for my plan but I'd have to weld the washer so it wouldn't spin or cut it off. NO NEED: the bolts which hold the NP241 case halves together (L) are the same thread pitch (M10x1.5 IIRC) and length, and I'm flush with these since I now have two extra t-cases in my white trash wheelbarrow....