What is this plastic latch/hinge called? Where can I buy it?

Hey everyone,

I have recessed lighting in my basement. I bought a new light cover, but the springs aren't cooperating to keep the cover in place. My light cover looks like this:

https://www.amazon.com/LumaPro-10F2...dp/B0195UWVRU?ie=UTF8&*Version*=1&*entries*=0

I am trying to think of a way to keep the lens in place, but still be able to remove the cover when needed to replace the light bulb. The only thing I can think of is this little plastic latch thing that is similarly used on my Ikea oven to keep the exhaust mesh in place. It looks like this:

Picture 1: https://www.dropbox.com/s/5a86ofhcg5sljwu/IMG_20160601_070039.jpg?dl=0
Picture 2: https://www.dropbox.com/s/jh5y8zy97l7k30c/IMG_20160601_070109.jpg?dl=0

Does anyone know what these white plastic things are called and where I can get them?

Or, does anyone have another idea of how I can keep this light cover in place, but also be able to remove the cover if needed?

Thanks!