I'm pretty sure all well-known brands of 6x9's will be able to be used with the adapters. But an issue you may run into with fitting them in the GN is the magnet might hit the trunk braces or bars or whatever. Infinity is known for having large magnets. I bought a set and after messing with them I couldn't get them to fit. I didn't put much effort into it, as I was busy at the time, but I have already returned the adapters. It was too late to return the speakers, so I have a brand new pair of Infinity Reference 6x9's and a pair of 3.5" same brand and model. If you wanna try to make them fit, let me know.