I dont think you'll be able to find any other manuf's dogbones that fit.. Seems they all make them just a hair different, so they cant be used in other cars.. The ball will be too big, or the pin, or the length, etc.. It's always something that dont fit.. But,I've onlybroken one on my Tornado S30 (rear-center) but that was after alot of tanks of fuel.. (But it did break where you said, right at the ball) But here's the thing.. On mine, I noticed the drive cup was damaged.. Where the "ears" (pin)on the ball of thedogbone ride in the cup, it makes a little groove on each side.. Which is fairly common and normal, I believe.. But what I noticed on mine was, one side of the cup had a deeper groove than the other, and I think it let the bone twist more, before it grabbed.. Check that on your sons.. It may be why he's breaking them so fast.. If that's not it, like someone else posted, it could be a restriction somewhere, on the end of the chassis that's breaking them.. Maybe a diff is too tight, or bearing is dirty causing resistance? Something must be up though, cause they shouldnt break that often.. Good luck tracking down the culprit!!