I have an issue with emissions, high CO & HC, so I'm working through possible causes...I was checking the coils & found that one coil has the signal connector locking tab broken off, so nothing to ensure the connection stays put and the need to buy a new coil. I decided to buy the coil online at OReillyAuto, well I just received the coil and it is an OEM Denso coil, with Mazda part # sticker attached for about 50-60 dollars less than any OEM part I've seen. It is their ImportDirect OE ignition coils, so if you need any and want the OEM version this may save you money

 

Nice! I just looked it up, it's showing -

23-0324 leading coil (2 plug wire hookups) $145.99
23-0325 trailing coil (1 plug wire hookup) $136.99

It looks like they only have 1 SKU for the trailing coil. Only downside is the label, the coil itself is the same.

It's about $185 from Atkins per coil and about $159 from a random Mazda parts source online (which will probably kill you on shipping).

Dale