OP, the adapters you found on eBay will work, but if you pay attention you'll notice they are flat, thus blocking instead of offering a smoother passage for the sound coming from your speakers. I have some that I tried. .....it does make a difference. Do yourself a favor, get a decent set of adapters like Hawgwired or Arc, and as mentioned make sure they're not knockoffs.
Sent from my SPH-L710
2010 FLTRX With Plenty of extras, goes by the name "Hardeshia"
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Also not pictured 2016 FLTRXS and 2017 FLTRXS, you never can have too many SHARKS......