Rear end swap/install

1968 Dart 270 said
Where is the best place to buy the correct u bolt kit for our cars? (1968 Dart 270)

Be sure to get the restoration type. They have the proper flat in the bottom of the U.

Also be sure you get the correct width. 7 1/4 uses smaller 2.5???? Wide, 8 3/4 use 3"

And the correct length

Mancini Racing 7-1/4 Axle Housing U-Bolts