The new battery tray had some problems with the bolt holes alignment, apparently all the aftermarket battery trays has more or less bad bolt holes alignment.
I started out by attaching one of the front bolts to create a hinge.
This is how bad the alignment of the rear bolt are ......
If I use the front bolt as a hinge and tilt the battery tray out until the rear bolt holes align.
Then I put a steel rod thru the holes and use that as a lever, and massages the rear sheet metal into alignment.
Now they are pretty close,
Eventually all the bolt came in place.