I have a GoPro Hero that my wife bought for me... Not a 3 or 4 or +, silver, black, but just a Hero like the one in the link below:
https://www.amazon.com/GoPro-CHDHA-301-HERO/dp/B00NIYNUXO
Whenever I look for a filter, it says it's for a Hero3 or Hero4, etc. I'm pretty sure the filters for a 3...