https://www.amazon.com/Remflex-6005-.../dp/B00B2HMF7G
https://www.amazon.com/Remflex-RF16-.../dp/B000TLL7JS
I know the 6005 is correct but double check the 16-000 just to make sure it'll fit (it should). I have a cheap OP with warped flanges and the remflex gaskets sealed it up. Don't overtorque, it only asks for 20 ft. lbs.