LS56 in Dreamcast Twin Stick and Saturn Virtua Stick

The sticks in the Dreamcast Twin Stick, and the JP Virtua sticks. Are those really LS-56? The PCB assembly and restrictors really look like they are LS-56. The one in the Virtua Stick is no big deal, but those in the Twin Stick presents an interesting variant. Is there anyway to get one such a LS-56 with the triggers?