To my amazement it worked for me. I made a .fzpz file out of your svg file and fzp file (needed to modify the .fzp svg file names to match the .fzpz format though.) and loaded it in to Fritzing and started parts editor on it.
I assumed the green end (circled in red) was where you wanted the pin so used that as the graphic:
clicked on select graphic then clicked on the green square and it made that pin1. Repeated for the other 3 pins and saved then exported the file, then dragged the new part in to the sketch (the red square on the top one indicates no connectors on the original file)
then connected the new connectors to a 4 pin header which works fine.
there is a problem with your svg though, the pins are not aligned on .1in boundaries as we see in the above image. The wires between the connectors (which are on .1in boundaries) don’t align with the pins on your svg. Here are the .fzpz files for the two parts:
this is the original svg (no connectors defined.) If you unzip the .fzpz file you will get
‘part.Drock Buck cant select graphic for pins_1299808866b534ebfe8512f9fbcb7ca7_2.fzp’
‘svg.breadboard.Drock Buck cant select graphic for pins_1299808866b534ebfe8512f9fbcb7ca7_2_breadboard.svg’
which is what a .fzp and svg file look like in a .fzpz file. The same two files will appear from test.fzpz, but the svg will have connectors defined. I’m using Fritzing 0.9.9 on Win 10 to test this but it should be the same for any version I think.
this is the file with the unmodified svg:
cannot-select-graphic.fzpz (154.2 KB)
and this is the file from parts editor (exported as a .fzpz file by right clicking on the left part in the mine parts bin and selecting export part and named it test.fzpz)
test.fzpz (664.2 KB)