Buddy Lazier #91, Dave Kneisel #711, Billy Pauch #1 & Chris Grbac #7  

I think you guys hit all of the all purple cars I was thinking of originally, and a bunch more... Here's a few late additions:

Buddy Lazier's #91 (1996 Indy 500 winning car): https://d2i8ejbvsgsqtt.cloudfront.net/gallery/indycar/indy/1996/19960101-nphotographer/med/1996_Buddy_Lazier.jpg

And here's a few more that weren't all purple but might be a good time to mention:

Dave Kneisel:

Billy Pauch:

Chris Grbac:

There's not a whole lot of purple on the #1 or the #7, but for some reason I thought of both of them as having more purple.

Thanks for all the responses!