the Tormek PR-250 would appear to be a dedicated knife sharpening machine
https://www.ricardo.ch/de/a/tormek-pr-250-mit-stein-sg-250-220-1220356278/
https://www.ricardo.ch/de/a/tormek-pr-250-mit-stein-sg-250-220-1220356278/#image_gallery_fullscreen
https://www.ricardo.ch/de/a/tormek-pr-250-mit-stein-sg-250-220-1220356278/#image_gallery_fullscreen
looks to me like the extra long support bar
https://tormek.com/en/products/accessories/us-430-extended-universal-support
would be suitable but maybe the position of the holes is not the same as the modern machines???
I think Tormek support would give best advice, like Ken says.
https://www.ricardo.ch/de/a/tormek-pr-250-mit-stein-sg-250-220-1220356278/
https://www.ricardo.ch/de/a/tormek-pr-250-mit-stein-sg-250-220-1220356278/#image_gallery_fullscreen
https://www.ricardo.ch/de/a/tormek-pr-250-mit-stein-sg-250-220-1220356278/#image_gallery_fullscreen
looks to me like the extra long support bar
https://tormek.com/en/products/accessories/us-430-extended-universal-support
would be suitable but maybe the position of the holes is not the same as the modern machines???
I think Tormek support would give best advice, like Ken says.