Agreed. The easiest thing to do is trim the stock one. If you look closely at the bottom portion of the cross-member itself it is just tacked welded on. Unbolt the cross-member, grind off the tack welds and retain the bottom portion. Then trim the cross-member so its even with your frame rails and then re-tack the bottom portion back onto the cross-member. You will also have to trim the cross-member mounts that are welded to the frame rails. Look up raised silverado transmission cross-member and you will get a better idea of what is involved.
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