Those are called rivets which are extremely durable and strong when installed correctly using a rivet gun, however, standard stainless bolts and nuts sourced from a local hardware store will work just as well.
My hitch for my R53 came in today and 3 hours later it is installed and the car is all back together. The fit and finish are excellent and I couldn't be happier with the product. The only problem I had is that the instructions mention zip ties and replacement trim mount clips but the little Baggie included in my box was empty. Someone forgot to pop the parts into the bag before tossing the bag into the box. Didn't really effect me because I didn't break any trim tabs and I have PLENTY of zip ties.
Thanks for a great and unique product that makes the ownership of our quirky little MINIs even better.
Dave
Chili Red Owner #552
David Rigg
Thank to Aaron,your aid is definitely for the last decision
Juan Dario Uribe Tuneinn
Just wanted to drop a belated thank you for the interior LED bulbs for my R61. The issue with the original items sent was corrected promptly and without a hitch. As a first time customer, you have earned my business. Keep up the great work!