If your crank looks like this -



- with the star shape and a bolt circle diameter of 122 mm and both rings bolt directly onto the ends of the spider arms, then you have a Stronglight 93.

If your crankset looks like this -

- where the large chainring bolts onto the crank using a 50.4 mm bcd chainring, and the smaller chainring is bolted onto the larger ring with spacers, then you have a model 49, and all sorts of other options are available.

Now, if you were REALLY lucky, you might have a model 99, that looks like this -


- in which case you have a bolt circle diameter of 86 mm, and can run small chainrings down to a 28T ring - but I suspect we're not that lucky.