Start with the arena layout and markings drawing (FE-00033) from
this page. This drawing is actually the key to the rest of the drawings.
On the right hand side of the first page of FE-00033, you will find a table that has a parts list. Part number 24, "Bump", is listed as Part Number GE-10047. So you would then go to the Game Elements zip file, which contains all the GE drawings, and pull the corresponding file. Some of the more complicated parts will cascade from the first drawing into other files, but this isn't one of those.