16X8.50-8+18x8.50-8 tire set (Whitman)

Hello my name is Sean and I am looking for a new-ish front and rear tire set so that I can change the tires on a lawn tractor to be exact they are for a 1987-88 wheel horse 211-4 Garden tractor the front tire dimensions should be 16X8.50-8 and the rare dimensions should be 18X8.50-8 if anyone has a set with those dimensions please pm me or text me at 781-523-5012

PS I am new to small engine repair and I have never changed a tire before on anything not even a bike but I have been watching videos on how to do so. Just fixed this tractor a couple of days ago but I still need tires for it