Stronglight is french made but they carry english thread... Actually the question isnt the thread at all because in the stores is super rare to find french stuff... I think i would be more worried about if the tange one is iso or jis. A jis cup is slightly smaller in the outside so if the frame is italian or english standard the cup it will be lose. It wont be tight in the front tube at all. So be carefull w/that, U can even put the cups with the hand instead of using the press cup tool needed for the job.

I bought a FSA english threaded headset time ago and was JIS, I had to sell it. So be carefull with the tange one (ask 1st). What kind of frame do u have?

UM