Weights are one of those things that if it fits, it fits. they were kinda standard but weren't completely. Things change around. So best advice, look at all the Pics you can find of tractors like yours. Take good measurements, making notes of bolt patterns of were they attach and with how many bolts. I've seen some models that had both 3 and 4 hole patterns punched into the same wheel. After all that also look at Pics of larger FWA tractors that may use the right size on the front for your rear. Knowing all this, you can now hunt for the hens teeth you desire.
Oh, remember that some models had multi-part weights used for the inside of the wheels near the axle (not inside the tire)and one piece for the outside of the wheel near the lugs.
Weights aren't cheap either. a dollar a pound is about the going price new or old. Some advice if you find the very ones you want/need dont pass them up. I messed up is all I can say....