Looks like the associated ones use a bit smaller diff cup, so I guess they won't work with the Losi. I may just get an entire Associated center diff. You can't get by with the 45t that Losi makes? Weird how they make larger gears in steel and only smaller in the plastic. I do like the plastic gear set up for Losi, but I think I will need larger than 45t myself (will see when I get a few pieces together).