No luck. They didn’t even have a part number for the lower anchors. You can buy the tether anchors for $15 each. I’ll have to look for a wrecked one and pull everything out of it.
We have friends with 2 cars and 1 car seat, too. The parent that has the kid takes the car with the car seat. They said it was easier to switch the adult from one car to another than the kid. 