1. You'll need the right BB. These probably used Stronglight's 118.5mm spindle length. Of course that will give you a slightly off chainline on either the inner or outer landing, so if this matters to you you might have to do a little experimenting.

2. Since you're building a fixed gear, what chainring size are you interested in? The 122BCD will limit the readily available sizes out there.

3. I have a Peugeot branded Stronglight 104 crankset you might be interested in, assuming #1 & #2 above don't sway your thinking.


EDIT: I didn't catch on my first reading that you had located a 45t ring - I think I have one of those, too, but I'll need to check condition. PM me if interested.