Hi Norm,
Yes, the throw is correct...it is the new steel deck (which basically means I can repair/weld the deck)
It is a steel deck, from Greenfield, for my 13-32
It seems a perfect fit, so far, but I am not finished...and the last 5% takes 95% of the time.
All holes line up - except for one missing hole (the engage/disengage outer lever fitting - only one hole needs drilling) - but I can drill this easily, with my eyes shut - not unlike my mowing.

You are spot on about keying a screwed vee-pulley - the pulley was just a very tight fit over the key but basically it was able to be pulled off - given some Inox, time, more Inox and a wee bit of a heat blast, then an almighty wrestle between man and machine. Man won. Many thanks to Gadge, who pointed this crazy mower in the right direction.

Upon observation, the new steel deck seems good. it is reinforced at most key points...except that I may weld an angle iron on the inner rear of the throw chute. Currently it is a 90 degree meeting of two plates...and this is the area where the alloy one gave up the fight against multiple rocks.

Yours in the fight against shaggy grass.
Tim