Swiss made Mercer test indicators use the same contact points as Compac (shown on this page). You can order any Compac contact point providing the length (L) is the same. Use the chart below to determine the correct length for your particular models.
A word of caution: don't confuse these Mercer model numbers with the Interapid metric indicators, some of which have the same numbers (312-1 for example)! Although the Mercer models are all discontinued, you can still use the Compac points.