[Shankenstein]

After reading the support section on HKS USA's website, it's likely that they will send the repair out to their Japan facility (between Tokyo and Nagoya). Turnaround time appears to be a couple weeks.

I'd contact the main HKS support and start the process. It's up to you to decide whether to buy a new unit or service the bent one. If this is not your daily driver, I'd let HKS take their time to rebuild the strut to spec. If you need the car ASAP, I'd swap back to stock, thoroughly inspect the nearby components, and get a professional alignment.

Best Guess: They'll replace pillowball cartridge, top nut, upper strut tube, seals, and piston assembly.

If the strut tube is scored on the inside, they'll probably swap the entire damper out. Many aftermarket coilovers use "cartridge" dampers, but I haven't had HKS coilovers before. Since your lower mounts look OK, I'd bet it's cheaper to rebuild than to buy an entire new unit.

Keep us updated, as the repair continues. I'd love to learn about the quality of their customer support.