I decided to bite the bullet and try them anyways. Turns out the 451 model floor mats fit very closely. The driver side is perfect except for the "glove compartment" on the floor is blocked by the back lip of a mat, and the passenger side fits very closely, the foam brick that covers the battery is a little tall and interferes a little bit with the mat. A little trimming when it's warmer out and it will fit 100%.
All in all these mats are amazing, the amount of snow and slush they've collected in the week or so since I've had them is unreal. And working off a mobile right now, but when I get to a proper computer I'll link up some photos to show everyone.