[thefro526]

D. The VENDOR should maintain sufficient stock or production capability to fill teams’ orders within
a reasonable period during the build season (less than 1 week). (Note that this criterion may
not apply to custom-built items from a source that is both a VENDOR and a fabricator. For
example, a VENDOR may sell flexible belting that the team wishes to procure to use as treads
on their drive system. The VENDOR cuts the belting to a custom length from standard shelf stock that is typically available, welds it into a loop to make a tread, and ships it to a team. The
fabrication of the tread takes the VENDOR two weeks. This would be considered a
FABRICATED ITEM, and the two weeks ship time is acceptable.) Alternately, the team may
decide to fabricate the treads themselves. To satisfy this criterion, the VENDOR would just have
to ship a length of belting from shelf stock (i.e. a COTS item) to the team within five business
days and leave the welding of the cuts to the team.)

The above clause kind of applies here, though it would change your Cylinder from being a COTS part (required for Pneumatics Rules) to a Fabricated Part.

This is a REALLY good questions for the Q&A. I believe a custom length Pneumatic Piston would be within the spirit of the rules as teams have been using them for years, but the Q&A's answer would be final.