smoker62
The rear of the blade fits on the foot rest rod.
I finally had time to put the blade on my 149 today. This blade was orginally used on a 1450 Cub Cadet. I have a few pictures that may help you. The first one is the measurement on the outside of the frame rail.
Several diffeent views/angles of the rear blade mount:
Right side (sitting on the seat):
Left side (sitting on the seat):
Hope this helps.
Let me know if you need anymore pictures.