https://www.burtonpower.com/prod_fil...=70014&PSet=98
Found these on a Ford racing specialist website (UK).
The hard-copy catalogue mentioned that the hydraulic clutch cylinder nose (APC5) has overall depth 80mm from bearing face to mounting face and safe travel of 22mm. It also mentioned that several customers have successfully fabricated their own mounts on gearboxes other than Ford units. Not sure if this can be modified to fit late style T1 gearbox.