I just wrote:
Barry,
On the Stronglight page you sent, what they caption as "Standard" is clearly stamped "Competition" in the close up, like mine. So to reiterate, yours are Stronglight Model 54 Competition. (I just measured mine and they're 6 3/4" or 172 mm.)
Then I looked at the Stronglight page again, and the close up of the 55 shows the same stamp. If I were you, I'd call it the more expensive "Model 55 Competition."
Mark Fulton
Redwood City
California