Thanks everyone for all the info from this thread and another.
I went and ordered a set of G6 for 2 - 72" mower decks. I received them yesterday, was raining earlier and I was working on tree trimming and such. I will post some pics, within the next few days.
I did have a slight nick on one of the cutting edges, painted over from the manufacturers. It is slight, was just a little surprised to see it. I don't have a balancer, but local mech. has one so had it checked - mainly because I was picking up some belts&filters there anyway.
I'll try them on the older fromt mower (f932). Has a stong blade in it now, so engine performance should be the same.