I don't think I have a parts breakdown of the S 145 CX but I do have one of the Marelli S 103 B. If no one posts a pic before I get home from work, I'll post it then.
You might also try HotSpark.com. They sell a breakerless trigger very like the Pertronix for about half the price. I'd suggest that you take a photo of your distributor showing how the points are mounted and send it to them.Unfortunally, I'm not able to find the correct spare part on the catalog on pertronix site