We do occasionally offer upgrades for older mythic tails  such as a full sized flukes and extra decorative fins that were not purchased with the tail originally, but we are currently not accepting mythic tails back for full fluke upgrades as our small team focuses on other aspects of studio production such as our silicone waitlist. When we accepted orders for fluke upgrades in 2020, upgrades were listed at $1,200 for a full sized fluke upgrade but this cost may increase as we reasses supply costs, inflation, etc.  All full fluke upgrades for past mythic tails are outfitted with a FINIS trainer monofin in your desired size.The full fluke upgrade for previous mythic tails does NOT include extra fins. Extra fins can be purchased under the normal fin upgrade web listings  AFTER purchasing your full fluke upgrade for previous mythic tail when we are accepting orders.If you purchase separate fin upgrades after purchasing a full fluke upgrade for a previous mythic tail please email the team at info@finfolk.com so we can make sure your orders are combined in our system. Right now, we do not allow the purchase of loose fins for older mythic tails and we do not accept older mythic tails back for the addition of fin upgrades without purchasing a full fluke upgrade from the website. Any fin purchase that is not connected to a new mythic tail purchase that is in production or a full fluke for previous mythic tail purchase will be automatically canceled/refunded. We are sorry for any inconvenience this might cause.With these upgrades, we only detach the old fluke, attach the new fluke, and attach any fins purchased at the same time. We do not offer mythic repair services at this time. We do sometimes sell loose fins when we have extras left from production, however this are shipped to attach yourself.