Bring this one back from the closet..

In the process of restoring my '70 Superbird, I have a k-member I was suspicious about. After reading this thread via search, I came to realize the geometry might be off. It seems I have a 71 #3583100 k-member since it appears I have a "00" on the tag stamped on the k-member. I know the proper k-member is #3466479, with a "79" on the welded tag. Can this 71 k-member be used? My buddy has the ability to reweld a reproduction ID tag on my current k-member. Or, I can try to trade it for a proper '70 k-member. After all, mine is more rare..