Power-trac 422 2003 model and 428 January 2015 model
Re: Used PT\'s
Keep and eye on www.power-trac.com Click on the title (Used PTs). There isn't a 425 there now but in the past and most likely in the future there will be one. If you don't get in a hurry and jump when the chance arrives you get yourself a deal.
The one on the PT422 built in 2000 is 1 and 13/16 inches. I suggest you call Terry to make sure. This is one expensive wrench. I paid $125 dollars at NAPA. I suggest you try other places. Clint Blake found two versions at Hanover Tools for a lot less.
You might try a local farmers Co-Op. If you have one close.
They have some large wrenches in the one close to me, by the nuts and bolts. I have never looked at the sizes but they are BIG, seems the prices were $85 or $90 for some of them. I go there to get Grade 8 bolts, they are cheaper than the hardware store, by about 25-30%.