I have a 1938 caterpillar R4, have the motor out been rebuilt,have every thing to go back to togather, make offer in Chillicothe Ohio, lost intrest , if not gone by nov 20 it will be scraped, my loss is your gain bought newer dozer and no longer interested in something so hard to get parts for , good rails,sprockets,and idlers, 10 foot hydrolic blade call Daniel@ 1-740-2538975 after 5pm thank you ,