Here is a scan from an options page in a Cutlass information book I bought years ago. The original copy isn’t the best. The mats are shown in the lower right corner. See Jim Noel’s article on this website titled 1961-1963 F85 Car and Option Prices. They are listed as option J3 for $6.36 and apparently only available for the front floor. The description is “Vinyl-covered mats protect the car’s carpeting, make interior cleaning easier”. It doesn’t say anything about available colors.
Well it’s not letting me upload the file. I can email it to you if you want. It’s a jpeg file.
I assume you got the email from Jim? His picture is way better than what I was trying to upload. He copied me on that email so I thought I would try and upload the photo here so that others could see it as well.