Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) Discussions

I have a well-used Ariens 10M7D that I recently purchased.  The tires look to be original equipment which would make them almost 40 years old at this point.  They still hold air but the cracks in the tread are a concern and I know that there have been some advances in traction technology since the late '60s.

I'd like to put on some X-Trac tires but they don't seem to have the 12.5 x 4.5 - 6 size.  Anybody here dealt with this issue?  I'd appreciate some advice on the proper replacement size.

Thanks.