cowling camloc

Did a search here and saw 40S5-1S as p/n for rv cowling. I measure the length of the one that is broken and falls nearest a -2.
(.694) Am I missing something? The cowling fits pretty good as is. Hate to order something to short. Thx for any info. DM

40S5-2S is the correct length. Several years ago there were some installs that seemed to work better with the -1S but since then, there have been revisions to the other fastener components which eliminated the -1S requirement.