I just bought a 10 mm nylon spacer, and it is both sturdy and weirdly light, like it is haunted by the ghost of Colin Chapman. Excellent design.
In a world of overpriced parts for sim-racing, this is a VERY welcome surprise. The 50mm spacer is very helpful for use with my set up to clear the data cable, but it was also integral to my plans for spacing the steering wheel out where I wanted it. The price is very attractive and the part is very good looking. Aside from that, it's a spacer and it does what spacers should do - move things and be super rigid. Done.
Great product and great seller. Fast shipping.