I ordered the ACC floormats from
www.stockinteriors.com. Basically, a different store front selling the same ACC floor mats that FC Zach purchased. I took the time to get color samples and everything.
"8078 - Dark Grey" was the closest match to the stock grey carpet.
I opted to go with "1066 - Grey" as that was available in thicker carpet. 1066 is a bit lighter than the stock carpet, but you really don't notice the difference much.
The floor mats fit decently, and offer a bit more coverage than the OEM mats. I have the original Toyota mats, but they are badly worn out. I'm keeping them around in case I ever want to get reproduction mats custom made.