Any reason I can't use this?

[BHyatt]

Here has been my thinking as I am planning to flip the axle in my '71 Chevy.

Why not use a pair of these and apply some welding?

http://www.summitracing.com/parts/SUM-720025/

Throw in a couple pairs of these:

http://www.summitracing.com/parts/CEE-7030/

Or something like this instead:

http://www.summitracing.com/parts/DJM-LB3LK/

Is there some reason this would be a bad idea?

It seems that it would be a lot cheaper than $156.99 (Around $114 cheaper).