Here is the email I got back for them:
Dear Andrew,
Thank you for your timely response and I apologize for the confusion and misunderstanding.
After speaking with my Product Development Team, they informed me that the older Toyota Landcruiser generally did not come with any factory floor hooks as I originally assumed.When we send these Floor Liners, we include a set of retention hooks that twist into the carpet and line up with the holes in the mats. If you already have a retention device in the vehicle, it is possible that it may not be factory installed.If you can send some pictures of your vehicle floor we can take a look at your specific set up to determine if our parts can be correctly installed in your Landcruiser.
If you need immediate assistance please contact me directly at 800.441.6287 EXT: 433
Best Regards,
Michael Price
WeatherTech