The footprint (with two o’s) for the LED you selected is:
The 0603 that eelik mentioned is the first number (0201 in this case). The 0603Metric is in metric units, and these are unfortunately still less often used. A 0603 (“Imperial”) is not the same size as a 0603 “Metric”.
The wikipedia page below has a size comparison chart between metric and imperial sizes for the common rectangular resistor, capacitor and LED packages, and also has an overview of some other package sizes.
The US Metric Association has been lobbying for metric units in the USA for a bit over 100 years.
The link below has a simple way of test fitting footprints by printing it out on paper. This may be useful if you already have the parts.
