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Yeah, the backup lights are pretty much the same type of bulb. But when it comes to interior lighting, some types will still say w5w but they are not the "tapered" type that the Mazdas seem to have. I've listed a few here: These first two, while they still list them as w5w AND compatible with Mazda CX-9, they will not fit in the Mazda's interior lighting. Only the third picture shows the dual tapered ends to the bulb that must be used for License, Map, and Second row lights. So all of these, including LUYED say w5w but only the ones at the far right will fit. At least that's my take. Do you agree?
Yes, but again, it's best to just look at the existing bulb and find an equivalent. In my case, when I changed the cargo light bulb to LED, I took it out, measured it then looked for an equivalent online. DE3175 is what I found would fit.
Guide - 2nd Generation CX-9: Cargo light bulb replacement/upgrade
This is a DIY How-To for a cargo light bulb replacement/upgrade for the 2nd Generation Mazda CX-9. I decided to document this process as it seems nobody has done it yet. Hopefully this helps someone who wants to upgrade their lighting or save a trip to the dealership. This process was...
mazdas247.com
Pull the bulb, find one that looks the same, confirm measurements.