Yep. You are correct. My notes say the same thing, but my fingers didn't wish to do the extra work of adding the 'W'. Sorry.
Regarding the length:
Yes, the longer nipple (0.636) is the correct one. I had similar problem with a set of Tresos for another gun once - two significantly different lengths for the same Treso part number. The retailer had purchased the nipples in bulk and mispackaged them. To be perfectly honest, I don't know for sure whether the 11-50-01 or the 11-50-13 is longer. It could well be that the ones you got are 'correct' and mine were mislabled. Sad situation.
Last edited by mykeal; December 4, 2009 at 07:41 AM.