Oh you want one side... Then the Yamaha parts guy is accurate. I have not cross referenced your part number.When you say 2 piece assembly - do you mean two different binding post modules with 4 posts each? Because, the one for the right speaker is working perfectly fine. I only need the one for the left speaker (which is on the right side lol). Unless you mean the 4-post module comes in two parts. What would the other part number be?