There probably isn't a whole lot of people who need this but I did, so I thought I'd share.  

This is a a replacement part for Mazda part number GJ6A505A1 (Cap, Drip Moulding)  

This is the little cap that covers the screw holes on the roofs of many late model Mazda vehicles. I lost the ones that came with my 2012 Mazda 5 after installing a roof rack, so I had to print some replacements. Four are required per vehicle. They slide into place with less effort than the originals, for easier removal later. The factory ones were pretty darn tight.  

One change to the STL that isn't reflected in the gallery photos is a little indented arrow to show the direction of removal.  

This isn't an exact replica of the OEM part, I modelled it based on pictures I found online, and measurements from the holes on my Mazda's roof.  

According to Jim Ellis Mazda Parts, the part should fit these cars:  

Mazda CX-7 2010, 2011, 2012  

Mazda CX-9 2010, 2011, 2012, 2013  

Mazda Mazda 2 2011, 2012, 2013  

Mazda Mazda 3 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013  

Mazda Mazda 5 2006, 2007, 2008, 2009, 2010, 2012, 2013  

Mazda Mazda 6 2014  

Print with support and 100% infill. ABS or Nylon is probably your best bet as PLA will probably not hold in the sun.  
It's a bit tricky to remove support material without destroying the little wings (because I did indeed kinda mess them up), but some needle nose pliers, and an X-acto knife, and patience will do the trick.  I printed in black ABS, and will probably spray them with some sort of paint to protect them from UV light and becoming brittle over time.