Measure the blade, go to Costco, they have a huge Michelin display of blades they want to sell. About 15.00 each, maybe cheaper. But like said measure the blade, so you know the length in inches. Measure both of them, they may not be the same length.
And although I have not looked at mine, now you have me curious. I think going to MH tomorrow to run genset charge batteries, will see what can be seen then. I will take picture and post it here. That is no guarantee that other models don't have different types of arms and blades.