I believe the 135 is comparable to my 1110 which has a 14" rim. Hoye sells rice tires for 14" rims and they are not too expensive. I have rice tires on my tractor and really like them. The small front tires on our tractors tend to not roll over things and those paddles really dig in hard. My tires look to be original (nearly 30 years old) and have plenty of bar left. The dry rot will get them first.
Depending on the diameter pattern, condition, and shipping costs I may have an interest in your old turfs.