I bought a T1520 a couple of years ago. I also have a FarmPro tractor I plan to sell shortly. I took the canopy and brackets off of the FarmPro tractor, painted the NH blue, and installed it onto my T1520. It fits perfectly and looks terrific!
You can get a new canopy, brackets and even the bolts from this website: Search results for: 'canopy'. You can even purchase a removable snow cab!
BTW - the canopy will fit over your ROPS system. You will need to drill two holes on either side of the ROPS, and use several big washers on each side as spacers.