I have an 870 with an 8A backhoe that blew out the dipper arm cylinder pulling a few stumps. The cylinder is beyond rebuild and repair as per the hydraulic folks who have rebuilt several others. I can't find a parts number and they can't find an after market replacement. HELP,,,need to get it fixed because spring is short and wifey's got garden stuff waiting....Where can you get parts for these older 8A backhoes?