[70SATMan]

'69 was a different deck lid than in '70 and original Parts Manuals don't list Alum option for the '69S. There have been a couple '69 one offs show up, probably related to the '69 GTS cars.

'70 was the first year listing the Alum lid and valance as standard on the S AND the E but, as has been noted, seems supply chain issues sometimes affected what ended up on the cars rolling off the floor.

I've also wondered whether decisions were made concerning the rear wiper option and especially the factory AC option as to whether the Alum lid could reasonably support those added weights. For sure, the original Alum lids in period had the boss for the rear wiper and there have been cars reported with alum lids and original optioned rear wipers. I don't know about the Factory AC cars.

Those optioned cars might have had lids supplied in steel though I've not seen notes like that in the original parts manuals.

I would think if supply chain had issues supplying the Alum bits, the Esses would have received priority over Es built in the same period. Another variable thrown into the mix has to do with where the bodies were being produced and painted... The S bodies were built at Reutter and the majority if not all of Es were Karmann built.

Both of those factories would have needed their own supply of Alum bits for fit and paint before they went to Porsche for final assy.