I'm sold on Roger's at [link=http://www.forguesresearch.com]Forgues Research[/link]

He mills them to your exact length needed, can colorize them blue or red or send them natural, nd custom drills/taps the two ends... for insatnce 1/4-20 on one end and 10-32 on the other...

Lighter than having a full bolt through the whole thing (and long case hardened bolts are hard to find locally)