I bought them for my Cat 426. It was not really worth it. They were just PDFs of some things from Cat's SIS. The resolution was not great so the photos were hard to see and it was incomplete. I got what I paid for but it was not what I was hoping for.
If you are computer literate there is a way to put SIS on a PC.
Thanks! That’s why I was afraid to pull the trigger on eBay.
I’m not really familiar with SIS, isn’t it a subscription based tool to order parts through?