http://www.gmpartsdirect.com/
GM PART # 12621399 $44.42
That has the flexplate, spacer, and bolts. All you will have to do is do a little grinding with a die grinder on the new flexplate to match you converter. The bolt holes are close but you have to open them up a little. Working fine on my LQ9/th400 and you won't beat the price!!!
You can see here what I am talking about.