It isn't unusual these days for a customer service rep not knowing the product line or which application you need. The manufacturer's part # for the 412 heavy duty is 412-4252C+ as per the Progressive website. At mawonline.com that part number lists for $239.95. The 412 that's not the heavy duty model is part number 412-4253C+, and it lists for $182.95 at MAW. All the part numbers from the application finder on the Progressive website are good ones.
If you end up with the 440's, let us know if they're worth the money.
