G'day Don,
A couple of bits of info that may be helpful here.
1. Ignition key - these mowers used a switch that just has a 'universal key'. If you can find a maker's name or part number on the switch, that would help a lot. 'Indak' was a common switch brand in the 1980's when the Anniversary series were made, and those keys are easy to find.
2. Drive clutch shaft - the Anniversary 12-30 and 12-32 models also used the same shaft, P/No GT7016.
Edit: A secondhand shaft is your best bet; good luck with finding one!
These 'long' version clutch shafts were rather fracture-prone; I seem to recall that GA Spares even offered an aftermarket version, back in the day.
Last edited by Gadge; 04/11/17 08:48 PM. Reason: Add info