If you snap off those bolts how do you remove it if you need to?
If you read the instructions and look in the box properly, you will find little coach bolts that you snap off in the head of a couple of the allen bolts, ensuring no-one can just unbolt the attachment and slap on a wheel from a sierra/ escort etc.
If you need to remove it, you drill it out....hassle??? Not really it's easy to do, and you will have the time/ equipment to do it. Potential theives may not.
are they universal, as there is one on ebay at the mo.
are they all the same and fit every car, or do you need a different one for each model??