Are they the right length?
It's not too surprising - you can find Yokomo parts for the Associated (especially the one-way).
Perhaps AE figured that, "Hey, we're making titanium buckles for our cars and they're really quite close to the same length as the XXX-s. . .it wouldn't cost us anything, really, to package some and sell them. . ."
But, if they work, use 'em!