Top Roller 4718355 for John Deere Mini Excavator Undercarriage 50G 35G 26G 30G. John Deere 50G 35G 26G 30G. This top roller also fits the following models but there are certain serial breaks. John Deere 27D mini excavators serial number 255560 and above John Deere 35D models serial number 265000 and above John Deere 50D serial numbers 275361 and above 1x Top Upper Roller. 1x Top Upper Roller. Please make sure it will fit your machine before purchasing it. If you are not 100%. Sure this is what you need, please find out your engine model, series number and contact.