This is borrowed from an Austin Healey 3000 but works so well that you would think it had been purpose-built for an SP250.
I use the SP250 clutch fork which accepts the AH3000 release bearing. We also have to skim the flywheel and move the locating pegs. The hydraulics are unchanged.
I have been fitting this conversion for around 5 years and some of my customers have now completed many thousands of miles without issue.