Kudos for that part being included.
I used those levers on my early Karate Monkey before the small noodle was included; the housing stop was inside the back of the lever body, like other aero levers.
Routing the housing into the back of the 287V lever, avoiding an angle of departure by the cable from the housing was a toil. Over time, the housing would migrate and recreate a harsh angle for the cable from the end of the housing, despite what seemed like strong steps to secure its position beneath bar tape for smooth operation. Always felt grinding while taking up cable and when reaching high effort upon pad contact, they felt like I was pulling a rope over an edge.
I my shop days, we always had several Dia Compe small part bins (from BTI?) that included mystery bits that I'm positive included noodle stops for aero levers that went unconsumed since "everyone already knows how to route housing to aero levers".
Andy Cheatham
Pittsburgh