I realise you are worried about the liability issues of selling these things, but would it be worth checking with your solicitor if they were sold as something like an "industrial vibration isolater" ??.
No reference on the invoice to an automotive application, with some disclaimer along the lines of "for agricultural/industrial use only" ??
BTW, I'm no legal expert, and have no idea if this would hold up legally, but I'm also in business, having to pay out a nice amount in public and product liability insurance.
![Crying or Very sad :cry:](./images/smilies/icon_cry.gif)
Just thought it might be a line to chase up, as I want to get my hands on a set too !
![Very Happy :D](./images/smilies/icon_mrgreen.gif)