As most Fit enthusiasts already know from various forums, North American Fits have a longer front end due to stricter crash test requirements, therefore no aftermarket or even OEM headlights from other markets will swap in without a full front end conversion. However, although the rear bumper of the North American spec Fit is also longer, taillamps are, for the most part, a direct swap; with the exception of some wire extending. I've compiled a list of all of the Fit taillights I've found so far:
OEM European Standard Bulb Taillamps:
This style is the standard taillights that are on almost all other countries for the Honda Fit/Jazz. Note that the turn signal bulb and the reverse bulb are reversed so that the turn signals are on the outside of the taillamps (see my other post about reversing the signal and reverse light.) Also, the taillamp and brakelamp functions are both on the top section of the taillamp, while the bottom red section is used for rear fog light, mandatory in many European countries. Usually the rear fog will be only on the driver's side, whichever side that may be in that country. On North American spec taillamps, both the top and bottom red sections will light up for taillight function, while the bottom red section also serves as brake lights with a dual filment bulb.
OEM JDM LED Taillamps:
They are available mainly on JDM vehicles because they do not have the rear foglamp feature required in many European countries. These were available after the facelift, and are the most popular replacement taillamps for Fit owners. There are three versions of these OEM LED taillamps. There is a Red/Clear version that's standard on the 1.3S, a Red/Smoked version that's available on the 1.5A, and a full clear version that's standard on the 1.5S. Replica versions of these taillamps are also available, but they do not have an accessible LED panel and therefore you can not change out individual LEDs if they burn out. There is also a replica of the clear/red version that keeps the lower reverse lamp section clear instead of trying to blend it in with a pink hue.
OEM Style Clear/Smoked Taillamps:
I have not seen these too often for sale. But once in a while they will pop up, and for a decent price. These are basically clear/smoked lense versions of E-code factory taillamps. E-code meaning they're made to European specs, which means they are meant to be direct swap with European taillamp arrangement described earlier. These often only have a bulb holder for the lower section on the Left taillamp, meant for European rear fog lamps. These will not be street legal in North America unless you add red reflectors somewhere else in the rear and side of your Fit.
OEM Bulb style LED taillamps:
These are designed to replicate the standard bulb style taillamps, but the top and bottom sections have been replaced with red LEDs. I have seen two versions of these taillamps; One that looks like the normal taillamp with red lenses over the top and bottom sections, and a smoked clear one.
Altezza Style Taillamps:
These are "Altezza" style taillamps for the Fit/Jazz. From what I've seen so far, these are actually quite popular as well overseas, especially SouthEast Asia. There are three versions available. The Red/Clear version are the taillamp of choice on VIP themed Fits. There is also a Black/Clear version available as well as a full clear version. All three versions are also available with an LED section in the main taillamp.
3D Style Taillamps:
3D, or as some people call them, "bug-eyed" taillamps are also available for the Honda Fit and Jazz. Two versions are available; Black, and Chrome. I'm not too sure about these taillamps as the holes for the two bug-eyed sections seem to be off-center in relationship to the reflector housing inside. I don't know how much that may affect light output. From what I remember, one of the bonuses of these 3D style taillamps is that you can paint the black version's housing to match (or not to match) the colour of your car, to give it another look.
You can also do some customizing on your taillamps to make them unique. Look at this post for some examples of customized Fit/Jazz taillamps.