never owned a tractor before but now have a 1635 and i added a ballast box with 500lbs but was thinking about adding wheel weights too , can't seem to find any that says they fit a 1635 , i bet there are a number of them or a site that has them. just use it for our road maintenance and if we get a big snow i can't plow out of thats only happened a couple times in 25 years . our road is about 15-17degrees mountain property , haven't had any problem when it's dry now with the ballast box helped a lot . but are wheel spacers worth the effort also . thanks