Capricorn did switch over to Novarossi a long time ago. Engines currently made by the same manufacturer are Sirio, REDS, Werks and Orion (ABI) but I can not tell if a rod will fit.

http://www.micromotori.com/pdf/sirio.pdf
Here a Sirio partslist, all "faster" engines listed do share the same rod but still I can not tell if it will fit.