the originals used an early ford one, from an Anglia if i remember correctly. Most hand brake mechanisms are similar. id just head down to the wreckers/U pull It, and find one you like. Ultimas used an early Mini one if i remember correctly. Early Subaru ones (EA motor cars) into the late 80s were still a fairly basic design as well. Most commercial vehicles also have a basic hand brake lever with not to much plastic around them. So look there as well.
Not sure what your chasing.
I got a my Anglia ones from a local ford specialist in Australia
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Hi,
although not original, I'm currently building one using a handbrake lever from a BMW-MIni, mainly selected as the lever ratio, is much higher than either a more period Anglia/Mini item. This coupled with a Wilwood handbrake caliper, there's a good chance it will get through an IVA
The EA engine Subaru cars I mentioned had a cable operated handbrake as part of the disc brake mechanism on the front wheels. This was on the Brat/Brumby Ute. So this may also have a similar ratio. not sure. just putting the information out there.