Question about Peak Design PL-S-3 Standard Plate

I have just received the JJC Quick Release Plate CP6. With a size of 43 x 43 mm, they just don't fit on my tripod. I need 40 x 40 mm. Can anyone tell me if this plate here (Peak Design PL-S-3) is 40 x 40 mm? Or which of the other plates has this dimension? Unfortunately, this (essential) size information is not on the plates offered here. Thank you