Outer Limits 4x4 Board

can any one tell me the diameter of the outer bolt patten of a chev flex plate, as mine wont fit, think that i may have a holden one , as the dia is 273mm and needs to be 290mm so if some one has a flex plate or turbo auto lying around and could measure this for me that would be great, or even if its as holden one , this might help. thanks in advance, Phill.

one on mine is 290 outside to outside of hole

chev have 2 sizes. cant tell you which is which,etc.

food for thought

thats a point, mine is to suit a powerglide