Not if it mounts to the OEM bracket - or if it can be adapted. I don't remember seeing that the bracket part numbers were different in OEMR listings, but I can check again...
OK - I just checked. The basic mounting bracket is the same, whether there's a compressor on it or the idler. The bracket for the idler I'd need, and the idler itself as well.
If it's less than $20, please get one. If it's less than $10, get two if you can. If it's more than $20, please let me know so I can decide what to do (my parts fund is a little low at the moment...)
5-90