I have a trial set,
There is a bit of a story behind them, they were in Police custody for a while as they were stolen out of my car and used as forensic evidence. They also have some (what I think is) superficial damage as I caught the guy breaking into the car and gave chase and he dropped them.
I will happily post them to you and you can have them FOC but I can't 100% guarantee they will do the job. But if they do then at least you have a free set