score:2
Here, by "equivalent" they mean to include any document that shows that you are authorized to reside in the US. So you could put your student visa number. If you look at the online information tool, you'll see that it tells you what documents you need:
- If you are not a US citizen, please provide proof of your legal status (green card, visa and I-94 or endorsed I-20 for students or endorsed DS2019 for interns..).