327 Chrome air filter with dual air snorkal

I have been looking for the chrome air filter with dual air snorkal at some swapmeets. I thought I had a found one and it looked 99% the same. But the vendor told me that it was from another engine a 409????. He said the 327/375 only difference was there is a groove missing on one of the sides of the air snorkal. He wanted $210 is that a good price?
On that same day i found the original and I notice the difference but it was damged and it was missing the base. He wanted $300 is that a good price? Can anyone tell me where the other one came from. Are this hard to come buy or should wait?
thanks for the help
german