[Elecraft] K2 SSB option problem

[Gordon LaPoint]

I'm building a K2, and so far its working.  I'm now assembling the KSB2 
ssb adapter.  In the step where I'm to put in the Filter Crystal set I'm 
supposed to find a calibration number on the envelope.   the Part number 
is E850006, the only other numbers on the envelope are:

29870-1  171109   , What do I use for a calibration number?

thanks,

Gordon - N1MGO