I installed Speardiver carbon blades in OMER Stingray foot pockets, here are my impressions. The Stingray foot pockets have a very nice finish and a soft comfortable pocket. The foot pocket tendons are a good medium stiffness. This means they'll provide good support for the carbon blades and a stiffer backbone for hard kicking. I don't like very stiff tendons because they don't allow flex at all in the back 2/3 of the blade which is hard on the knees.
The Stingray footpocket tendons have a T slot and require tendon rails to be glued onto the blade edges. The tendon T slot accepts the rails well. The stingrays accept a conventional blade back edge, but for it to go all the way to the end of the slot a small recess needs to be shaped in the back edge of the blade. The recess is not absolutely necessary as the blade fits deep enough in the foot pocket regardless.
OMER Stingray foot pockets are available from FreediveStore.com in a nice range of sizes to suit most divers. Speardiver fins are available installed in Stingray foot pockets Speardiver Carbon Fins.
Pics of the Stingray footpocket and a Speardiver carbon blade with a reshaped back edge.