The #27s and #37s are pretty close...I picked up a pack of each when I added a working front coupler to my Rivarossi berk around 8yrs ago.
Generally speaking...the #5 is the most useful by far...while I've only ever used 1 #27 or #37.
Generally speaking...the #5 is the most useful by far...while I've only ever used 1 #27 or #37.