Mustang Rider Lawn Mower by Mowett in the State Ok

washington, DC
I have a mustang rider (very small rider mower). I bought it new approximate 30 years ago. It sat idle in my garage for 15 years. I put in a new carburator. It runs like a charm. Has an automatic anti-choke mechanism. I am looking for new tires for the front and back wheels. If you know of a source, please give me a shout-out. Thanks, Augustan