Heaterbox

#7
The parts book says there are actually 4 variations, though I think the last two are just a change in the rubber seal at the base of the heater.

Yours
Vern
 
#9
More specifically for SC & Auto cars, the change points are all in suffix E range of serial numbers and the final version from suffix G onwards. For the TC the final version is on suffix D cars forward.

Yours
Vern
 
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