Maybe I don't understand the drop down options. Does the #XY define the gsm?
Cover weight is given in pounds, often denoted as # or lb - 65 lb cover, 80# cover weight, etc. You can find the gsm conversions on the paper weight chart.
What is the gsm of this paper?
Because there are several weights offered in the drop down, it may be best to the cover weight with the gsm from our paper weights table.