@MParr
Dug up the info. It's a Lawn Boy SilverPro Series Model 10252 Walk-behind Power Mower
Serial number 9909383
Nice green frame. Thanks for your help.
The OEM part is unavailable.
They are 14” wheels. Measure the axle diameter. A Craftsman, Toro, or MTD replacement may work. The Craftsman, Husqvarna, Poulan fit 1/2” diameter axle shaft.
MTD will fit 1/2” diameter axle shaft.
The widths will need to be checked with the original wheel.
If your particular mower is self propelled and rear wheel drive, that could be a problem.