I emailed joe at Sierra who doesn't have the part but offered help (Seems like a nice guy):
Can anyone supply these measurements?
I don't have any parts for the later Spridgets---but I see looking at the Moss site that they appear to be very similar to the clutch master pushrod but lacking the knob at the piston end that is trapped under
the retaining washer. I wonder if a pushrod from a discarded clutch master cylinder could be cut to the right length and used for the brake master.
<u> <span style="color: #FF6666"> If you can get some dimensions from a correct brake pushrod, including overall length from center of clevis pin hole to end, width of the slot in the clevis, and clevis pin diameter, </span> </u> I could check through the similar cylinders from other applications that I have in my bonepile for one that might be cut to match. Or perhaps you have or
know someone who has an old clutch master from which you could rob the pushrod if it matches well enough.
Hope this helps.
Joe
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Heather & Joe Way
Sierra Specialty Automotive