Maybe its just uncomon to your dealer or he is just talking about the R3T which has the same parts as the R3 at any rate sometimes they are hard to get and as for tent stakes they are not the best.
keep in mind although they are weakly designed they usually fail do to improper adjustment and or say pulling on them when your clutch is in full lock up is another reason as with one of mine. I do know of people who have put tons of miles on them without breaking one me I am not as lucky but I have learned. I might add I have yet to break a lifter piece but I thought if I can break the shaft well you know
This is why I state proper adjustment is critical to the life span of the shaft and Flip is right about the other reasons that can cause failure!!!! to much pull and over reving the engine can cause a burn out affect between the two pieces do to spring pressures which can tend to over thrust the clutch head bearing and or flex the lifter shaft to far to many times till failure occurs.
Just my 2 cents worth.