Not to be picky or anything but, I would personally Put more than 3- 1/4 bolts on the extenders.
I would think that 4 -5/16 grade 8 bolts with plates on both sides of the rail would be a lot stronger than what you have.
When you come off of a jump and land on the back of the suspension I can see a disaster waiting to happen. Just my $02.
PS, glad to see you fixed the problem with the offset, looks much better.
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