ever installed in turbo action shift kit? where does the plug go??

Here is the drawing in the instructions for turbo action shift kit #17810
http://s766.photobucket.com/user/goodbyehorse/media/IMG_1708_zps7027c712.jpg.html
It is pretty obvious the rod goes with the shuttle valve, but the spring that is supposed to be removed and replaced with the plug on the left side is not present on my '73 904.

Here is the picture which comes in the newer Turbo Action kit for later trans'
http://s766.photobucket.com/user/goodbyehorse/media/ta_kit1_zps2e43ba53.jpg.html
you can see a lot more clear that the plug is supposed to go with whatever that third valve is. My valvebody has only the 1-2 and 2-3 shift valve pictured. I ended up leaving out the plug, and keeping the rod with the shuttle valve, and it seems to be shifting fine.