If you want your shape to extend beyond the connection points you can use the following technique:
1.) Draw a line that spans the distance of the two connectors, e.g., 19"
1b.) I don't remember if you need to add connection points at each end of the line.
2.) Go to menu bar>shapes>grouping>convert to group.
3.) Place your shape, and then align it the line, centered horizontally, bottom edge on the line.
4.) Select the line, and then your shape, go to menu bar>shapes>grouping>add to group
5.) Identify the group, open the shape sheet, and change the LocPinY to 0.
6.) Identify your shape, format>protection>lock aspect ratio
7.) Size your shape as desired, but keep the alignment
That should do it.
HTH
Wapperdude