In reply to Toccata:
If your interested in used, and are size 45, I have an older model pair that are in great condition. Bought at the time as a back up to another SL pair I used. Only used them a few times on short walks after buying to confirm they were still a good fit for me. Otherwise been stored in their box.
An alternative you could consider, though not ideal as fit still same, is Engo blister heel patches which reduce friction. I’ve used these in other footwear where heel friction was caused by fit problems. They stick to the boot/shoe and last several hundred miles.
Anyway, hope you find what your after. Scarpa SL were my go to boot for decades.