For those who have 91-93 cars and are doing the '99 conversion, simply replacing the headlamp buckets and radiator support really is the easiest way to do things. The buckets used for the pop-up headlights and those used on the 94+ projector-style headlamps are very different. If you plan to use the ones on your 91-93 car, you have to cut the front lip off and custom make mounting brackets to mount in the 99 headlamps. Replacing these parts with those from a 99 means all the mounting points are there and they will perfectly fit the 99 lights.
We now list the buckets for all years, should you simply need to replace your parts and not doing a conversion of some sorts.
Note that the 91-93 Stealth do use different headlamp buckets from the 3000GT.
NOTE: Installing these does require cutting existing welds and rewelding these parts in, so it is recommended that a professional body shop do the installation.