My Calmini UCA where too small. The "eye" where is swivels from that you put the bushing in were about 1/2" closer than the stock UCA's. Hopefully someone understands what I am trying to say and can use the real terminology for the parts. But basically, if the UCAS were mounted, there would have been 1/2" play Left to Right because of the smaller width between the two "eyes" where the bushings go. Hope it helps a bit....

http://www.cardomain.com/ride/2462507