Truth. It does fit the map lights properly, however, I just didn't buy the one that fits the dome light because this one fit "close enough".I would still suggest brand-name products. They do fit properly.
This bulb is 31mm, not sure what the stock bulb size is, I think it was 28mm?
EDIT: Correction: I thought all 3 bulbs (both maps and the overhead) were 31mm because of a post I read here:
I'll throw my calipers on the stock and replacement bulbs to see if I can find the discrepancy. I'm guessing that the map lights ARE 31mm, which explains why they fit fine, but the dome light is shorter in length. If that's the case, it's definitely not the product that is to blame - it clearly states 31mm.