Lots of good info here:
http://www.zr1netregistry.com/forum/...ead.php?t=4489
http://www.zr1netregistry.com/forum/...ead.php?t=1536
Measure the bolts on yours.
It is possible the wrong ones were used or just not torqued correctly.
Either way, something wasn't right.
TomC
"Crabs"