Vintage Minor Register

Has anyone ever seen the spec. for these? I have the spec. of the rear ones as they are the same as the M Type, and their spec. appears in Blower. But the M Type front road springs are flatter than the Minor springs (and don't therefore have the rubber bump stops) - and presumably the main leaf is slightly shorter so that the shackle sits at about the same angle to the vertical as on the Minor.

I am in desperate need of a pair of sound front springs for the McEvoy - hence the enquiry.