You might be best off finding a scrap body on eBay. I think parts for older Athearn models are going to become harder and harder to get.
Well, sorry, I did it about 5 years ago.
Try the link I posted.
Mike.
My You Tube
Well Athearn help isn't much help. Only told me the MP15 ones are discontinued and that the GP15 ones are out of stock. The search continues!
If it is in the part section of the Athearn website you can order easily. When you order, it will come from Horizon Hobby. I found the shipping charge a lot less than what was shown on the Athearn site.
It's been awahilke ago, but I contacted Athearn about getting screens for a Genesis GP15, and I was able to get the complete detailing set.
I think it was about $15.
Not sure if they still do that.
Here's another place you can check out:
http://kvmodels.com/ho-scale-products/
They also have an Ebay store, by the same name.
I have 2 genesis models that are missing one side of their radiator grilles ( MP15Ac and GP15-1)
It looks like both are the same so one set for either one should do the trick. I have had no luck in finding them! Does anyone know where I could track a set down?
Thanks!