I bought 48 and 40 tooth rings for my Stronglight 93 from an eBay seller in the Netherlands. The 48 is perfect and it has the hole for the pin, so it actually is a front ring. The 40 looks just like a ring for a 93, but the holes for the chainring bolts are undersized. I've already solved the problem using my drill press, but I'm curious to know what crank that ring was made for.