JimVL...This was my response from Weathertech 2 months ago:
"Thank you for your interest in MacNeil Automotive Products. We apologize for the delay in our response.
Regarding your 2015 HardTop Floormats or Liners, if there was a difference between the 2 door vs. the 4 door, there would be a question on the website asking to choose with which the vehicle is equipped. The floor coverage currently listed on our website would accommodate both 2 and 4 door models.
Regarding the cargo liner for the flat load floor, we currently do not have one available. Please check the website every so often as it us updated daily. "
Back then their website only said "hardtop", now at least it says "2 door", so hopefully soon it will say "4 door" too. I'm not convinced that the front mats for the F56 would fit the F55 either. Another F55 owner tried F56 mats, and said they were at least 1/2" narrower, so sand, snow, etc could easily get by.