The problem Spoon is addressing isn't after everything is torqued.... it's WHILE you are torquing/installing.
Try loosening the bolts on the x-member (or almost any suspension component) and you may notice some play in the bolt holes.
When torquing these bolts the twisting motion of the bolt head can move the x-member very slightly so instead of the x-member being perfectly square with the chassis it's now slightly crooked causing unwanted suspension characteristics.
Those hole spacers are supposed to keep everything centered for easy/accurate install.
The amount of play is probably negligible though and if you were really worried about it you could probably trace some circles around the bolt holes to be sure they are centered on the bolt head when torquing.
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