Hope this information is of use.
I have an early 28 Canadian produced car. Emergency brake on right side. Engine number in the CA13000's range. Firewall stamping 5-29-28. No date stamp on frame. The car was in original condition when purchased. It had round pedals, but had been converted to a single plate clutch. I have another car that has a a CA58000's range engine with a multi disk clutch and it has oval pedals. Another car I know of with a multi disk clutch had oval pedals CA50000's range. Attached pics 1 drivers side cabin 2 oval pedals on housing.