thanks everyone for the input.
the flexplate is brand new in the box.
I got it as part of a package deal with the pistons/wrist pins/rings.
the crank bolt pattern is 7 holes. 6 are equal spacing and the last one I assume is for correct positioning.
it has a counterweight welded to the plate.
it's zinc plated.
there are 6 converter holes which are oblong.
I bought it used. the seller listed it as 1500 miles of use on a 2500 stall converter.
it looks brand new and has 3 mounting bolt holes. it's 12 inches across.
I was expecting it to match the flexplate, it doesn't.