Hex bit size for targa top

I recently bought a 1990 Turbo that is in great condition, except the hex bit tool for the targa top was missing. What size is this hex tool? I assume I am able to buy it at an automotive/hardware store in town.
Thanks much. shane

The hex bolt should be an M8, so try that, also have to tried to local toyota dealership to by a new targa tool kit? Looked on ebay, supraforums, or any junkyards for a used one?

whats a targa top. ? i know its sort of like a sun roof.. but i doubt im close . is it like what spyder cars have?.

It's where the entire middle section of the roof can be removed, so your left with an open air hole from the windsheild to the back of your head. T-tops are the same only a beam is left in the center running front to back to stiffen the car up. Spyders would be convertables.