hi a guy in the USA is planning to make some with a spring clip instead of the original design which would break off
search you tube for "Z4 E85 Top Panels Re-imagined!"
he is looking for around 50 to subscribe and he will start making them.
There are a couple of pairs on eBay for sale presently. A guy on the Facebook Z4 uk owners is looking
to sell his but cannot decide how much he wants for them