I am in the same position ( broken sim tray) but mine is the tray for a standard size sim not the large credit card sized one. If anyone knows where I can source one it would be much appreciated.
The sim tray has a little lip/locator at the side to help slide it in and the sides and end on mine is broken so the sim is unsupported and when pushed in. It does not make contact with the contacts. I bought the car with the tray broken so I would like to get the phone aspect working again. If someone showed a photo with the dimensions (orthographic projection/working drawing) I would have a crack at 3D printing one.