I have a pair of Jensen JPS368 triaxial speakers that I no longer have any use for. 5x7/6x8, supposedly 35watts RMS/175 watts max, 92dB sensitivity, 50Hz to 21KHz frequency response. I had these in the NB right after the bosectomy, and they were weak on the bass, and induced quite a bit of rattle in the doors since I didn't mount them right.
They dropped right in as replacements (except for the connector) for a Ford I had that required 6x8 speakers, and have a few years on them from that time. They still sound the same.
Like the title says, they are free for the asking.