I have a Ryobi 875r gas trimmer. The drive cable in the upper shaft assembly broke. After doing some research, I guess this model is known for doing that. I am trying to find the replacement part number for that cable, and from what I read online, I have to order the entire upper drive shaft assembly. This is not the lower drive cable in the attachment, this is the one that connects to the engine in the upper shaft assembly. I am not the original owner of this trimmer, so I don't know where it was bought. I have looked online at the MTD, Techtronics, and a few other websites. But, none of them match up with the model numbers on this trimmer. The only numbers to be found are these: PPN - 501419 Serial - 008152270 26.2 cc displacement Engine Family - XN4XS.0264A2;EM It does have the (800) 345-8746 number to call, but they were no help and said I need to find a number that starts with a 41, such as 41AD something, 41CD something, etc.. I went to our local Ryobi service center, and they said the same thing. If anyone has any suggestions, please let me know. Thanks!