question about simplicity mower

Hello, my neighbor has a 5212 simplicity riding mower he blew the rear axle out can anyone tell me what model of simplicity will replace it I have a 707 but I am not sure it will work I don't think it will please email me with response and put simplicity mower in subject line or if anyone can inform where to look to get the info I need thanks
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The 707, is that the model that is rubber band driven or the wind-up model ?
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it is the type that has the rubber band and conboobulator valve
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