Note:  when comparing to others, most don't include the bolts, ours does.  The bolts may appear different than what's pictured, though.

This flexplate will allow your LS1 series engine bolt up to a 4L80E or TH400 with the standard 11.5" bolt pattern.  Bolts and spacer are included.  Spacer can be removed so the flexplate can used with the early 6.0 that had the longer crankshaft.