Car roof protector holders

So, I've got this thing called a car, it's quite common in 21st century (at least first quarter). Sometimes I leave it out on the sun, and it gets hot. Sometimes I even have things inside that I don't want to get too hot. And sometimes it's raining ice-cube balls and my car doesn't like that. Here is the part that you will ask "Why don't you get proper protection like a normal person?" First of all, where am I gonna find a condom that big? And second, I'm a sucker for... Well, umm, let's leave it at that.
Ok, on a more serious note, this holders hold protection sheet (or any sheet for a matter of fact) above the roof, so sunlight doesn't directly hit you cars roof, but you still have full access to doors. This was designed for my mk.3 Subaru Impreza with roof rails, it might work with other roof rails. For one set you need 1 holder, 1 long bolt and 1 short bolt. I have 4 of these sets for my car.
Holder has two threaded holes, hole on the back is for short bolt, that you use to fix the holder in postion on roof rail, and through top hole comes long bolt that holds your protector in place.
I designed it with SoldWorks 2016, and I'm attaching SW files, so you are able to redesign the holder to fit your car. I did put an emblem on it, but had some serious ghosting on it. You can delete it from SW part.

Post processing was sanding the holders, applying some car body filler (spray) and sanding it again. After that paint was applied. Link to a great post-printing tutorial by Jure Korber in Post-Printing.

Picture shows it holding a blanket I have in my car.

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