That "179393" is almost certainly a Focus part number for the linkage set. I couldn't find a direct retailer listing for that specific SKU, but it's worth trying a few angles.
@Ghostrider.1127 is the part number you're sharing for the Bosch-specific linkage set? That's genuinely useful. Armed with that,
@garyfreerider should contact Focus directly through their dealer network, as
eBike24 stocks original Focus spare parts straight from the manufacturer and is worth trying that number there. Also worth noting:
Focus spare part availability on the free market is notoriously patchy compared to brands like Mondraker or Nukeproof, so going direct to Focus or an authorised dealer with that part number is likely the fastest route rather than hunting around third-party shops. A German Focus dealer will have system access to order by number even if it's not visible online.