Today's Featured Article - Horsepower Defined - by Staff. Our low prices and years of research make us your best choice when you need parts. We sell tractor parts! We have the parts you need to repair your tractor - the right parts. However, if you spot an error please use our Feedback Form to let us know. We have tried to keep this data as accurate as possible. Just click on a model to see the serial numbers and the years it was manufactured. There are 52 models listed for Caterpillar.