Here's the reason why I recently listed a set of OEM seat speakers
over in Parts... JL Audio TR350-CX or TR350-CXiThese are a direct-fit, 3½" speaker. 25W RMS, 4 ohms. Frequency response 130Hz - 22KHz.
A nice step up from the OEM seat speakers. Respectable low frequency response for their size, clean mid-range, crisp and accurate highs.
The only problem is now we have to replace the dash speakers because even with NOS units in there, the JL's out-shine them by a long shot.