We have a C-9 Caterpillar engine in a Challenger 755 track tractor that had the bearing freeze up on it. According to the nearest Cat dealer there is not one in the U.S. It is part no. 10r-1428. Have any ideas where we can get one in this country? Is it possible to get the bearing and just replace the bearing? Maybe even one out of a salvage tractor? We are 20 acres from finishing wheat planting.