I would would purchase 12 slot shutter disk, so i can replace my opus on my 78 XJS prehe.
I assume you can then purchase the FAST 700-0300 kit and substitute the Fast shutter disk (6 or8?) for 12 slot disk? Is the correct Kilbert?
I read a post on this forum by ED Sowell who measured a 12 slot disk from his Crane disk see Crane XR700 12-slot shutter disk
Regards Al