Have you found one yet? I might have found you one, and if not, I can make a run to my dealership (family/friends, they are great people.) and ask around. I can just walk right in the diesel shop, and it seems he always has blown engines and exhaust parts scattered all throughout the shop, so I might can grab one for ya. How much are you looking to spend?
I know when they did my HG's under warranty I asked for all the leftover parts and they gave 'em to me, no questions asked. They said it just gets trashed anyways.