When I originally rebuilt that part on mine one spring had been replaced with a non matching one and between that and some other crappy field fixes the previous owner had done they managed to destroy half of the small boggie tires. I went to a local spring shop , gave him a good one to copy explaining how the replacement had to match , was told no problem. Turns out yes problem , so 4 new springs later , all good . As they say , it's just money. Good luck