The mount fits great. One of the nylock bolts wouldn’t stay in the interior boss, but this turned out not to be an issue since I’m using the magnet mounts. Ended up using woodworking clamps to align bolts. Assembly was easy.
Only issue is the sides of the mount have several areas where the 3D printing manufacturing approach shows up as slight ridges. I understand the limitations of 3D printing, but for the price, I expected a better cosmetic execution. See the ridges on top of the bottom edge in the attached picture.
I added stainless steel washers on the bolts which hold the frame together to insure that the bolt heads did not damage the surface of the side pieces. Also, the magnetic mounts are not nylocks, so I added split-lock stainless steel washers under the heads of the 6mm bolts which attach the magnetic legs. The kit should probably be updated to include the necessary (IMHO) 6 mm washers and split-lock washers. I didn’t want the magnetic feet to vibrate loose due to buffeting by the wind at 75 MPH.
I ended up spraying the mount with automobile paint coded to the color of my. Van. I doubt that the 3D printing artifacts will be very noticeable once it is on the roof of my VAN.
Functionally, the product is a winner, and I expect it to last several years. But, docked one star due to 3D printing artifacts which make the product look like a first-run result of a hobbiest’s new 3D printer.