indycar.com, click on "race details", takes you to /http://view.ceros.com/indycar/2021-spotters-guide/p/6
Scroll down, click on "downloadable pdf"
Just realized it's listed numerically, not in grid order. But there is a text only lineup if you click on "starting lineup" about halfway down this page:
https://www.indycar.com/Schedule/202...dianapolis-500
So, I've printed one of each to take with me when I walk from my house to the track in about an hour and a half...can't wait to be back.