Hood Pins

I was wondering if anybody has installed this style of hood pins, and why is there such a huge discrepancy in pricing? Any issues?
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I`ve got a couple on the side "center" of my fiberglass hood , they are a bit of a pain to get set right. I don`t think I would depend on all 8 being those either. If u try to put them in a curved part of the hood , their even more hastle. I had one in the back center behind the 6 pack scoop and ended up pulling it for a alum. hood pin. When I get around to trying to fit a filter on my new victor intake , I might try one for the breather hold down--------