You might download the parts pages for your tractor and also the one for the lx172 to compare them side by side. These are free to get and you can mess around with them comparing pictures and part numbers too. You should be able to tell by looking at the mounting hardware and aparatus and your own.. should be very clear to see for yourself. Just a suggestion is you are a die-hard DYI'er like me...
Check this out and put in your model to see for yourself:
